Review Notes in Police Photography

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Review Notes in Police Photography : 

Review Notes in Police Photography By MELCON S. LAPINA, MSCrim 4th Place, Criminologists Board Exams, October 1996, Manila melcon s. lapina, mscrim

VIPs of Photography : 

VIPs of Photography Joseph Nicéphore Niépce was able to obtain camera images on papers sensitized with silver chloride solution in 1816. He invented a photographic process which he called “heliography,” meaning “writing of the sun.” melcon s. lapina, mscrim

VIPs of Photography cont… : 

VIPs of Photography cont… Louis Jacques Mande Daguerre invented “daguerreotype”. Daguerreotype is an early photograph produced on a silver or a silver-covered copper plate; also: the process of producing such photographs. It formed an image directly on the silver surface of a metal plate. It was a positive process, thus it yielded one-of-a kind images. melcon s. lapina, mscrim

VIPs of Photography cont… : 

William Henry Fox Talbot invented a process called calotype (a photographic process by which a large number of prints could be produced from a paper negative; also: a positive print so made.) Calotype used paper with surface fibers impregnated with light sensitive compounds. VIPs of Photography cont… melcon s. lapina, mscrim

VIPs of Photography cont… : 

Note: Calotype vs Daguerreotype Fixation in calotype was only partial while images in daguerreotype were made permanent with the use of hypo (short for hyposulfite thiosulfate: sodium thiosulfate or a solution of sodium thiosulfate). Sodium thiosulfate or hypo is a hygroscopic (readily taken up and retaining moisture) crystalline salt used esp. as a photographic fixing agent and a reducing or bleaching agent. VIPs of Photography cont… melcon s. lapina, mscrim

VIPs of Photography cont… : 

John Frederick William Herschel coined the term photography and applied the terms negative and positive to photography. VIPs of Photography cont… melcon s. lapina, mscrim

VIPs of Photography cont… : 

He made improvements in photographic processes, particularly in inventing the cyanotype process and variations (such as the chrysotype), the precursors of the modern blueprint process. VIPs of Photography cont… melcon s. lapina, mscrim

VIPs of Photography cont… : 

He discovered sodium thiosulfate to be a solvent of silver halides in 1819, and informed Talbot and Daguerre of his discovery that this "hyposulphite of soda" ("hypo") could be used as a photographic fixer, to "fix" pictures and make them permanent, after experimentally applying it thus in 1839. VIPs of Photography cont… melcon s. lapina, mscrim

Slide 9: 

VIPs of Photography cont… Frederick Scott Archer invented the photographic collodion process which preceded the modern gelatin emulsion. melcon s. lapina, mscrim

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VIPs of Photography cont… Collodion is a wound-dressing material made of nitrated cotton dissolved in ether and alcohol, and other chemicals on sheets of glass. melcon s. lapina, mscrim

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VIPs of Photography cont… Richard Leach Maddox was an English photographer and physician who invented lightweight gelatin negative plates for photography in 1871. melcon s. lapina, mscrim

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VIPs of Photography cont… George Eastman founded the Eastman Kodak Company and invented roll film, helping to bring photography to the mainstream. melcon s. lapina, mscrim

Slide 13: 

Definition of Terms Photography Literal Definition: To write with light. From 2 Greek words: phos – light and graphia – write. Modern Definition: It is an art or science which deals with the reproduction of images through the action of light, upon sensitized materials, with the aid of a camera and its accessories, and the chemical processes involved therein. melcon s. lapina, mscrim

Slide 14: 

Definition of Terms cont… Photography Technical/Legal Definition: It is any means for chemical, thermal, electrical or electronic recording of the images of scenes, or objects formed by some type of radiant energy, including gamma rays, X-rays, ultra-violet rays, visible light and infrared rays. melcon s. lapina, mscrim

Slide 15: 

Definition of Terms cont… Photography Technical/Legal Definition: This definition is broad enough to include not only the conventional methods of photography but almost any new process that may be developed. melcon s. lapina, mscrim

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Definition of Terms cont… Police Photography – An art or science which deals with the study of the principles of photography, the reproduction of photographic evidence, and its application to police work. melcon s. lapina, mscrim

Slide 17: 

Definition of Terms cont… Forensic Photography – The art or science of photographically documenting a crime scene and evidence for laboratory examination and analysis for purposes of court trial. melcon s. lapina, mscrim

Slide 18: 

Aims & Purposes of Photography in LE Work Take photographs of the following: melcon s. lapina, mscrim

Slide 19: 

Aims & Purposes of Photography in LE Work Conduct comparative examination and analysis of questioned photographs or pictures to the known photographs. Process color and black and white film, print, reduce and enlarge picture. Reproduce picture and other printed matters. Compose portrait by means of portrait composition. Provides photographic intrusion detection devices. Maintain Rogues’ Gallery (a collection of pictures of persons arrested as criminals.) melcon s. lapina, mscrim

Slide 20: 

Care and Handling of Camera Must be carried using a portable bag or built-in container to avoid dust and dirt. Must be kept dry and avoided contact with water and other liquid substances. Must be repaired only by qualified technician. Must not be cleaned by oil. Must not be fixed without proper equipment and tools to avoid serious damage on it. melcon s. lapina, mscrim

Slide 21: 

Basic Camera Parts and Functions Camera is a light-tight box; with a lens to form an image with a shutter and diaphragm to control the entry of the image; a means of holding a film to record the image/and a viewer or viewfinder to show the photographer what the image is. melcon s. lapina, mscrim

Slide 22: 

Basic Camera Parts and Functions Camera originated from the term camera obscura. Camera obscura (Latin veiled chamber) is an optical device used, for example, in drawing or for entertainment. It is one of the inventions leading to photography. The principle can be demonstrated with a box with a hole in one side (the box may be room-sized, or hangar sized). Light from a scene passes through the hole and strikes a surface where it is reproduced, in color, and upside-down. The image's perspective is accurate. The image can be projected onto paper, which when traced can produce a highly accurate representation. melcon s. lapina, mscrim

Slide 23: 

Basic Camera Parts and Functions melcon s. lapina, mscrim

Slide 24: 

Basic Camera Parts and Functions A freestanding room-sized camera obscura at the University of North Carolina at Chapel Hill. One of the pinholes can be seen in the panel to the left of the door. melcon s. lapina, mscrim

Slide 25: 

Basic Camera Parts and Functions melcon s. lapina, mscrim

Slide 26: 

Basic Camera Parts and Functions A freestanding room-sized camera obscura in the shape of a camera located in San Francisco at the Cliff House in Ocean Beach (San Francisco) melcon s. lapina, mscrim

Slide 27: 

Basic Camera Parts and Functions Light Tight Box. This part of the camera is very essential because of its capability to exclude all unwanted light that may expose the sensitized materials or film. It is an enclosure that is devoid of light. melcon s. lapina, mscrim

Slide 28: 

Basic Camera Parts and Functions Lens. The lens is the only responsible in focusing the rays of light coming from the subject. It is one of the most important parts of camera because without lens, it is impossible to form a sharp image of the film. melcon s. lapina, mscrim

Slide 29: 

Basic Camera Parts and Functions Film Holder. The film holder holds the film firmly inside the camera. It is always located at the opposite side of the lens of the camera. Shutter. The shutter served as the barriers of the rays of light that will enter and effect the film inside the camera. It is usually placed at the path of the light passing thru the lens melcon s. lapina, mscrim

Slide 30: 

Other Parts of the Camera Viewing system Film advancer Shutter speed Lens aperture Focusing mechanism melcon s. lapina, mscrim

Slide 31: 

Major Types of Camera Viewfinder type. Single Lens Reflex. Twin Lens Reflex Type. View or Press Type. Special Cameras. melcon s. lapina, mscrim

Viewfinder Type : 

Major Types of Camera cont… The smallest and simplest type of camera. This is also known as instamatic camera. Viewfinder camera suffers parallax error. Viewfinder Type melcon s. lapina, mscrim

Single-Lens Reflex Type : 

Major Types of Camera cont… Single-Lens Reflex Type Cross-section view of SLR system:1) Lens2) Mirror3) Shutter4) Film or sensor5) Focusing screen6) Condensing lens7) Pentaprism8) Eyepiece SLR Cross Section melcon s. lapina, mscrim

Slide 34: 

Major Types of Camera cont… SLR Cross Section The best way to determine the entire coverage of the camera is to look behind the lens of the camera. In this manner, the object can be framed properly and recorded on the film. This type of camera eliminates the problem on parallax error. melcon s. lapina, mscrim

Slide 35: 

Major Types of Camera cont… Twin Lens Reflex Camera – 2 lenses: 1. for viewing & focusing of the subject, & 2. for taking lens. In this type of camera, the image to be photographed is seen as flat surface as the image is reflected by the mirror behind the viewing lens. This suffers also parallax error. melcon s. lapina, mscrim

Slide 36: 

Major Types of Camera cont… Parallax – The difference between what the viewfinder on a point-and-shoot camera sees and what the lens sees (and thus records on film). At close shooting distances, this difference can cause you to crop off the top of a subject’s head. melcon s. lapina, mscrim

Slide 37: 

Major Types of Camera cont… Parallax error – The image you see through the viewfinder is different from the image the lens will capture. melcon s. lapina, mscrim

Slide 38: 

Major Types of Camera cont… Parallax error – The image you see through the viewfinder is different from the image the lens will capture. melcon s. lapina, mscrim

Slide 39: 

Major Types of Camera cont… 1 2 3 4 5 6 7 Lens Plane Front Standard Lens Axis Base Film Holder/Ground Glass Rear Standard Film Plane VIEW OR PRESS TYPE melcon s. lapina, mscrim

Slide 40: 

Major Types of Camera cont… VIEW OR PRESS TYPE CAMERA. The biggest and most sophisticated among the different type of camera. This type of camera is practically useless for candid and action photography. melcon s. lapina, mscrim

Slide 41: 

Major Types of Camera cont… SPECIAL CAMERAS. These are cameras that have been devised that offer unique advantage or serve special purposes. Among the special cameras are: a. polaroid, b. panoramic cameras, c. aerial cameras, d. miniature and ultra-miniature cameras e. digital cameras (using computer processing) melcon s. lapina, mscrim

Slide 42: 

Control of Cameras Knowing the controls on camera is necessary to produce a sharp and normal image and negatives after photographing. There are three important controls in a camera to be manipulated and adjusted to its proper setting. Focusing control Diaphragm/Aperture control Shutter speed melcon s. lapina, mscrim

Slide 43: 

Control of Cameras cont… FOCUSING CONTROL. The camera lens bends light rays to form an image or likeness of the object. Adjusting the lens to form the clearest possible image is called focusing. melcon s. lapina, mscrim

Slide 44: 

Control of Cameras cont… Focusing is defined as the setting of the proper distance in order to form a sharp image. melcon s. lapina, mscrim

Slide 45: 

Control of Cameras cont… Three Types of Focusing Rangefinder Type (e.g. viewfinder, instamatic camera and 35mm cameras) Ground Glass Type (e.g. twin-lens reflex camera and digital camera) Scale Bed Type (e.g. press and view camera, and Polaroid Evidence Camera) melcon s. lapina, mscrim

Slide 46: 

Control of Cameras cont… Rangefinder Type The rangefinder type is classified into two: Coincidence type – the object to be photographed looks double when the focusing control is not in proper distance, and by moving this control, one of the objects will move and coincide with the other object to make as one and become accurate appearance of an object. melcon s. lapina, mscrim

Slide 47: 

Control of Cameras cont… Coincidence Type Out of Focus In Focus melcon s. lapina, mscrim

Slide 48: 

Control of Cameras cont… Rangefinder Type cont… Split Type – Splits the objects to be photographed into two. While moving the focusing control, the split image will move and unite to form an undivided appearance and therefore the focus is accurate and perfect. melcon s. lapina, mscrim

Slide 49: 

Control of Cameras cont… Split Type Out of Focus In Focus melcon s. lapina, mscrim

Slide 50: 

Control of Cameras cont… Ground Glass Type Ground glass type focusing mechanism clearly indicates whether the object distance and the camera is out of focus or not. If the object is not well focused, the object to be photographed will appear blurred. To make it clear and accurate the focusing ring of the camera is adjusted on clockwise or counter clockwise to get the desired clearness of the object. melcon s. lapina, mscrim

Slide 51: 

Control of Cameras cont… Scale-Bed or Focusing Scale In the scale or bed type focusing mechanism, the distance of the object to be photographed is calculated by means of feet or meter. There are cameras where estimated distance from the camera to objects is being indicated in the focusing ring. melcon s. lapina, mscrim

Slide 52: 

Control of Cameras cont… melcon s. lapina, mscrim DIAPHRAGM CONTROL (lens opening) A device called a diaphragm usually serves as the aperture stop, and controls the aperture. The diaphragm functions much like the iris of the eye—it controls the effective diameter of the lens opening. Reducing the aperture size increases the depth of field, which describes the extent to which subject matter lying closer than or farther from the actual plane of focus appears to be in focus.

Slide 53: 

Control of Cameras cont… melcon s. lapina, mscrim

Slide 54: 

Control of Cameras cont… melcon s. lapina, mscrim Aperture and shutter speed are the fundamental controls available to the SLR user: Varying one or other of these opens up a myriad of creative possibilities. Both also control how much light reaches the film – so if you make the hole through which the light passes into the camera (the aperture) smaller; you must keep this hole open for longer (the shutter speed) to compensate.

Slide 55: 

Control of Cameras cont… melcon s. lapina, mscrim Fortunately, on most cameras this adjustment is made automatically. The size of the aperture is measured using f/numbers (or f/stops). Confusingly, as f/numbers represent fractions, the larger the f/number the smaller the aperture. The widest aperture on a lens might be f/2, whilst the smallest aperture available may be f/22.

Slide 56: 

Control of Cameras cont… melcon s. lapina, mscrim

Slide 57: 

Control of Cameras cont… melcon s. lapina, mscrim Minimum aperture – In this shot, the aperture being used is f/22 – the smallest opening available on a 100mm lens. As this lets in only a small amount of light, the aperture was opened for longer than when the opening used was wider. On this occasion, a shutter speed of 1/30 sec was needed so that the film received enough light to give correct exposure.

Slide 58: 

Control of Cameras cont… melcon s. lapina, mscrim Mid aperture – With each stop that the lens is opened, twice as much light is let in as the one before. Here the aperture used was f/8 – 3 stops wider than the f/22 used above. So the f/8 setting means 8 times more light reaches the film than with the shot above. To get the same exposure, the shutter has to be open for just 1/8 of the time it was before – in this case, just 1/250 sec.

Slide 59: 

Control of Cameras cont… melcon s. lapina, mscrim Maximum aperture – Opening the lens a further 2 stops to f/4 lets in 4 times more light. The shutter needs only to be open for a quarter of the time compared to the previous shot – so a shutter speed of 1/1000 sec, the fastest on many cameras, was used. Notice how changing the aperture in the 3 shots has affected how many of the cups are in focus. This is known as depth of field.

Slide 60: 

Control of Cameras cont… SHUTTER SPEED. Shutter is a device that allows light to pass for a determined period of time, for the purpose of exposing photographic film or a light-sensitive electronic sensor to light to capture a permanent image of a scene. melcon s. lapina, mscrim

Slide 61: 

Control of Cameras cont… Types of Shutter (as to position) Central shutters Focal-plane melcon s. lapina, mscrim

Slide 62: 

Control of Cameras cont… Central Shutters Central shutters are mounted within a lens assembly, or more rarely behind or even in front of a lens, and shut off the beam of light where it is narrow. A leaf mechanism is usually used. melcon s. lapina, mscrim

Slide 63: 

Control of Cameras cont… Focal Plane Shutter In camera design, a focal-plane shutter is a type of photographic shutter that is positioned immediately in front of the focal plane of the camera, that is, right in front of the photographic film or image sensor. melcon s. lapina, mscrim

Slide 64: 

Control of Cameras cont… A focal-plane shutter. The plastic curtains travel vertically. melcon s. lapina, mscrim

Slide 65: 

Control of Cameras cont… Types of Shutter (as to mechanism) Focal-Plane Shutters Leaf Shutters Diaphragm Shutters Central Shutters melcon s. lapina, mscrim

Slide 66: 

Control of Cameras cont… Focal-Plane Shutters (as to mechanism) Focal-plane shutters are usually implemented as a pair of cloth, metal, or plastic curtains which shield the film from light. melcon s. lapina, mscrim

Slide 67: 

Control of Cameras cont… Leaf Shutters A leaf shutter is a type of camera shutter consisting of a mechanism with one or more pivoting metal leaves which normally does not allow light through the lens onto the film, but which when triggered opens the shutter by moving the leaves to uncover the lens for the required time to make an exposure, then shuts. melcon s. lapina, mscrim

Slide 68: 

Control of Cameras cont… Leaf Shutters Simple leaf shutter1. Shutter plate2. Aperture covered by leaf shutter3. Aperture during exposure4. Leaf blade5. Catch mechanism6. Butterfly spring melcon s. lapina, mscrim

Slide 69: 

Control of Cameras cont… Diaphragm Shutters A diaphragm shutter is a type of leaf shutter consisting of a number of thin blades which briefly uncover the camera aperture to make the exposure. melcon s. lapina, mscrim

Slide 70: 

Control of Cameras cont… Diaphragm Shutter melcon s. lapina, mscrim

Slide 71: 

Control of Cameras cont… Central Shutters A central shutter is a camera shutter normally located within the lens assembly where a relatively small opening allows light to cover the entire image. The term is also used for shutters behind, but near to, the lens. melcon s. lapina, mscrim

Slide 72: 

Control of Cameras cont… Central Shutters cont… Interchangeable lens cameras with a central shutter within the lens body require that each lens has a shutter built into it. In practice most cameras with interchangeable lenses use a single focal plane shutter in the camera body for all lenses, while cameras with a fixed lens use a central shutter. melcon s. lapina, mscrim

Slide 73: 

Control of Cameras cont… In photography, shutter speed is a common term used to discuss exposure time, the effective length of time a shutter is open; the total exposure is proportional to this exposure time, or duration of light reaching the film or image sensor. melcon s. lapina, mscrim

Slide 74: 

Control of Cameras cont… There are many factors to be considered in using this control. Some of these factors are: The light sensitivity of the film, which are determined through its ISO; The lighting condition; The motion of the subjects on different angles; and The purpose of the photographs to be taken, etc. melcon s. lapina, mscrim

Slide 75: 

Control of Cameras cont… The different shutter speeds are: 1, 2 or 1/2 sec, 4 or 1/4 sec, 8 or 1/8 sec, 15 or 1/15 sec, 30 or 1/30 sec, 60 or 1/60 sec, 125 or 1/125 sec, 250 or 1/250, 500 or 1/500 sec, 1000 or 1/1000, 2000 or 1/2000. melcon s. lapina, mscrim

Slide 76: 

Control of Cameras cont… Camera shutters often include one or two other settings for making very long exposures: B (for bulb) — keep the shutter open as long as the shutter release is held. T (for time) — keep the shutter open until the shutter release is pressed again. melcon s. lapina, mscrim

Slide 77: 

Control of Cameras cont… Avoiding Camera Shake Unless you are using a tripod, the first thing you should ensure when choosing the shutter speed is that it is fast enough to avoid camera shake. However tightly you hold your camera, it will always move slightly as you fire. If you use too slow a shutter speed this will mean blurred pictures. The speed you use depends on the focal length of lens you are doing. melcon s. lapina, mscrim

Slide 78: 

Control of Cameras cont… How to Hold Your Camera To be able to use the slowest possible handheld speeds, you must hold the camera correctly to avoid as much vibration as possible. melcon s. lapina, mscrim

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Control of Cameras cont… melcon s. lapina, mscrim

Slide 80: 

Control of Cameras cont… melcon s. lapina, mscrim Low-level shooting – you don’t always want to take your pictures from normal eye level. This kneeling position allows you to take shots at waist level.

Slide 81: 

Control of Cameras cont… melcon s. lapina, mscrim Minimum shutter speeds for handheld shots

Slide 82: 

Control of Cameras cont… melcon s. lapina, mscrim When to Use Slow Shutter Speeds By using a tripod, or other camera support, photographers can use slower shutter speeds than usual. These allow you to use apertures that would not otherwise be possible when using a handheld camera – and to shoot in the lowest light. Slow shutter speeds can also be used for creative effect, as moving subjects will become artistically blurred.

Slide 83: 

Control of Cameras cont… melcon s. lapina, mscrim Maximizing Sharpness – In this shot, the aperture used is the smallest available (f/22 on 35-70mm zoom) to ensure that as much of the picture as possible was sharp. This meant using a shutter speed of 1/15 sec – which if used handheld would not have been fast enough to avoid camera shake, therefore a tripod was used to hold the camera steady.

Slide 84: 

Control of Cameras cont… melcon s. lapina, mscrim Nightscapes – With a solid tripod exposures lasting several seconds – or even minutes – are possible. This means that you can shoot pictures throughout the night. For this cityscape, the exposure used is 4 sec.

Slide 85: 

Control of Cameras cont… melcon s. lapina, mscrim When to Use Fast Shutter Speeds Moving subjects require you to consider using a faster shutter speed than that needed to avoid camera shake. Some blur may be welcome with action subjects, but often we want to freeze the action. Selecting the right shutter speed depends not only on the velocity of the subject, but also on the direction in which it is traveling.

Slide 86: 

Control of Cameras cont… melcon s. lapina, mscrim Frozen in Mid-Air – It is not just for sport pictures that you need fast shutter speeds. There is movement in practically everything we see – and sometimes this needs to be frozen crisply. In this shot the boy jumped on the photographer’s command, and the shutter speed used was 1/1000 sec.

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Control of Cameras cont… melcon s. lapina, mscrim

Slide 88: 

melcon s. lapina, mscrim A lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light, converging or diverging the beam. The Lens

Slide 89: 

melcon s. lapina, mscrim The Lens lens

Slide 90: 

melcon s. lapina, mscrim The Lens Lenses can be used to focus light.

Slide 91: 

melcon s. lapina, mscrim The Lens Types of Lenses 1. Biconvex 2. Biconcave 3. Plano-convex/plano-concave 4. Convex-concave or meniscus 5. Positive or converging lens 6. Negative or diverging lens

Slide 92: 

melcon s. lapina, mscrim The Lens

Slide 93: 

melcon s. lapina, mscrim The Lens BICONVEX A lens is biconvex (or double convex, or just convex) if both surfaces are convex.

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melcon s. lapina, mscrim The Lens BICONCAVE A lens with two concave surfaces is biconcave (or just concave).

Slide 95: 

melcon s. lapina, mscrim The Lens PLANO-CONVEX or PLANO- CONCAVE If one of the surfaces is flat, the lens is plano-convex or plano-concave depending on the curvature of the other surface.

Slide 96: 

melcon s. lapina, mscrim The Lens MENISCUS A lens with one convex and one concave side is convex-concave or meniscus. It is this type of lens that is most commonly used in corrective lenses.

Slide 97: 

melcon s. lapina, mscrim The Lens POSITIVE OR CONVERGING LENS If the lens is biconvex or plano-convex, a collimated or parallel beam of light traveling parallel to the lens axis and passing through the lens will be converged (or focused) to a spot on the axis, at a certain distance behind the lens (known as the focal length). In this case, the lens is called a positive or converging lens.

Slide 98: 

melcon s. lapina, mscrim POSITIVE OR CONVERGING LENS This lens is always thicker at the center and thinner at the sides. Light passing through it is bended toward each other on the other side of the lens meeting at a point. It produces a real image on the opposite side of the lens or where light is coming from. The Lens cont…

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melcon s. lapina, mscrim The Lens cont…

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melcon s. lapina, mscrim The Lens cont…

Slide 101: 

melcon s. lapina, mscrim NEGATIVE OR DIVERGING LENS If the lens is biconcave or plano-concave, a collimated beam of light passing through the lens is diverged (spread); the lens is thus called a negative or diverging lens. The beam after passing through the lens appears to be emanating from a particular point on the axis in front of the lens; the distance from this point to the lens is also known as the focal length, although it is negative with respect to the focal length of a converging lens. The Lens cont…

Slide 102: 

melcon s. lapina, mscrim NEGATIVE OR DIVERGING LENS This lens is always thinner at the center and thicker at the sides. Light passing through it is bended away from each other as if coming from a point. It produces a virtual image on the same side of the lens or where light is coming from. The Lens cont…

Slide 103: 

melcon s. lapina, mscrim The Lens cont…

Slide 104: 

melcon s. lapina, mscrim The Lens cont…

Slide 105: 

melcon s. lapina, mscrim Inherent Lens Defects or Aberrations 1. Spherical Aberration 2. Coma 3. Curvature of Field 4. Distortion 5. Chromatic Aberration 6. Astigmatism 7. Chromatic Difference of Magnification The Lens cont…

Slide 106: 

melcon s. lapina, mscrim SPHERICAL ABERRATION When light passing through near the central part of a converging lens is bended more sharply than those rays falling in the edge, thus the rays coming from the edges are focused on a plane nearer the lens than those coming from the central part. The Lens cont…

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melcon s. lapina, mscrim The Lens cont…

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melcon s. lapina, mscrim The Lens cont…

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melcon s. lapina, mscrim The Lens cont…

Slide 110: 

melcon s. lapina, mscrim COMA This is another form of spherical aberration but is concerned with the light rays entering the lens obliquely. The defect is noticeable only on the outer edges and not on the central part of the lens. The Lens cont…

Slide 111: 

melcon s. lapina, mscrim COMA cont… If a lens has coma, circular objects reproduced at the corners of the negative are comet-like form. Just like the spherical aberration, it is reduced by combinations of lenses of different curvatures. The Lens cont…

Slide 112: 

melcon s. lapina, mscrim The Lens cont…

Slide 113: 

melcon s. lapina, mscrim The Lens cont…

Slide 114: 

melcon s. lapina, mscrim CURVATURE OF FIELD This is a kind of defect where the image formed by a lens comes to a sharper focus in curved surface than a flat surface. The correction of this defect is similar to spherical aberration and coma. The Lens cont…

Slide 115: 

melcon s. lapina, mscrim The Lens cont…

Slide 116: 

melcon s. lapina, mscrim DISTORTION A lens with distortion is incapable of rendering straight lines correctly; either horizontal or vertical lines in an object. This is caused by the placement of the diaphragm. If the diaphragm is placed in front of the lens, straight lines near the edges of the object tends to bulge outside. This is known as the barrel distortion. The Lens cont…

Slide 117: 

melcon s. lapina, mscrim The Lens cont…

Slide 118: 

melcon s. lapina, mscrim DISTORTION cont… If the diaphragm is placed behind the lens, straight lines near the edges tends to bend inward. This is known as the pincushion distortion. Distortion is remedied by placing the diaphragm in between the lens component and the two opposite distortions will neutralize each other. The Lens cont…

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melcon s. lapina, mscrim The Lens cont…

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melcon s. lapina, mscrim The Lens cont…

Slide 121: 

melcon s. lapina, mscrim CHROMATIC ABERRATION This defect is the inability of the lens to bring photographic rays of different wavelengths to the same focus. Ultraviolet rays are bent the most while infrared rays are bent to the least when they pass through the lens. This defect is reduced by utilizing compound lenses made up of single lens made up of glass of different curvatures. The Lens cont…

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melcon s. lapina, mscrim The Lens cont…

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melcon s. lapina, mscrim The Lens cont…

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melcon s. lapina, mscrim ASTIGMATISM This defect is present when the size of image produced by photographic rays of one wavelength is different from the size produced by another. Size of the image increases as the wavelength of the rays decreases. The Lens cont…

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melcon s. lapina, mscrim ASTIGMATISM cont… In color photography it produces a rainbow colored fringes around the edges of objects while in black and white photography, it appears as a slight blue. The Lens cont…

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melcon s. lapina, mscrim The Lens cont…

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melcon s. lapina, mscrim The Lens cont… Classic example of astigmatism. Left wheel: no astigmatism. In the presence of astigmatism (middle and right wheels) one discriminates between the sagittal and tangential foci.

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melcon s. lapina, mscrim Types of Lenses (as to degree of correction to lens aberration) 1. Achromatic lens – corrected for chromatic aberration. 2. Rapid-rectilinear lens – corrected for distortion. 3. Anastigmat lens – corrected for astigmatism as well as the other lens defects. 4. Apochromatic lens – also corrected for astigmatism but with higher degree of correction to color. The Lens cont…

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melcon s. lapina, mscrim Focal length is the distance measured from the optical center of the lens to the film plane when the lens is set or focused at infinity position or far distance. Focal distance is the distance from the optical center of the lens to the film plane. Focal Length

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melcon s. lapina, mscrim Focal length is a measure of the light-bending power of a lens. It is invariably measured in millimeters (mm). The longer the focal length of a lens, the narrower the angle of view, and the larger objects appear in the viewfinder without the need to move any closer to them. Long focal length lenses are called telephotos – short focal lengths are called wideangles. Focal Length cont…

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melcon s. lapina, mscrim Wide-angles A lens with a focal length of 50mm is known as a standard lens – the view that it gives is similar to that of the human eye. Any lens with a shorter focal length, and wider angle of view, is known as wide-angle. Focal Length cont…

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melcon s. lapina, mscrim Focal Length cont… This picture shows the views afforded by common wide-angle lenses.

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melcon s. lapina, mscrim Focal Length cont… How Focal Length Affects Image Size Lenses work on the principle that light affecting from a subject can be bent using the refractive properties of glass to form a miniature image of the subject.

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melcon s. lapina, mscrim Focal Length cont… How Focal Length Affects Image Size cont… Lenses with short focal lengths, such as the wide-angle lens, produce a small image. Telephoto lenses, with longer focal lengths, produce a larger image, when taken from the same distance.

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melcon s. lapina, mscrim Focal Length cont… Wideangle Lens – A short focal length results in a smaller image. Telephoto Lens – Long focal lengths bring objects closer to fill the frame.

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melcon s. lapina, mscrim Focal Length cont… Telephoto Lenses Telephotos are lenses with focal lengths greater than 50mm. They range from 70mm short telephotos to ‘long toms‘ with focal lengths of 1000mm or more.

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melcon s. lapina, mscrim Focal Length cont…

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melcon s. lapina, mscrim Focal Length cont… Zoom Lens It is a kind of lens with variable focal length.

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melcon s. lapina, mscrim Focal Length cont… Does Focal Length Affect Depth of Field? Aperture is not the only factor that affects how much of a scene is in focus. You should also take into account the focal length of the lens being used and the distance that the lens is focused at (generally the distance from the camera to your subject). The longer the focal length, the more restricted depth of field becomes.

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melcon s. lapina, mscrim Focal Length cont… So, all things being equal, a wide-angle lens keeps more of the scene in focus than a telephoto one. In addition, depth of field becomes increasingly more limited the closer you are to the subject that your lens is focused on.

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melcon s. lapina, mscrim Focal Length cont…

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melcon s. lapina, mscrim Focal Length cont… Factors Affecting Depth of Field These diagrams show how aperture, focused distance and focal length can individually affect how much of a scene is in focus. The shaded area indicates the amount of depth of field in front of, and behind, the subject.

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melcon s. lapina, mscrim Focal Length cont… Aperture – The larger the aperture the less depth of field. For maximum depth of field, use the smallest aperture Focused Distance – The closer the subject you focus on, the less depth of field. Depth of field is greater with distance subjects. Focal Length – The longer the lens you use, the less depth of field you will have. Wide-angle lenses give the greatest depth of field.

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melcon s. lapina, mscrim FILMS & PAPERS BLACK & WHITE FILMS Emulsion - a suspension of a sensitive silver salt or a mixture of silver halides in a viscous medium (as a gelatin solution) forming a coating on photographic plates, film, or paper.

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melcon s. lapina, mscrim FILMS & PAPERS BLACK & WHITE FILMS cont… Gray or Anti-Halation Backing - a layer found in modern photographic films. It is placed between the light-sensitive emulsion and the tough film base, or sometimes on the back of the film base. The light that passes through the emulsion and the base is absorbed by the opaque anti-halation layer.

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melcon s. lapina, mscrim FILMS & PAPERS BLACK & WHITE FILMS cont… Gray or Anti-Halation Backing - This keeps that light from reflecting off the pressure plate or anything else behind the film and re-exposing the emulsion, reducing contrast. The anti-halation layer is rendered transparent or washed from the film (as in K-14 films) during processing of the film.

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melcon s. lapina, mscrim FILMS & PAPERS BLACK & WHITE FILMS cont… Film Base - A film base is a transparent substrate which acts as a support medium for the photosensitive emulsion that lies atop it. Despite the numerous layers and coatings associated with the emulsion layer, the base generally accounts for the vast majority of the thickness of any given film stock.

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melcon s. lapina, mscrim FILMS & PAPERS BLACK & WHITE FILMS cont… Film Base - Historically there have been three major types of film base in use: cellulose nitrate, cellulose acetate (cellulose diacetate, cellulose acetate propionate, cellulose acetate butyrate, and cellulose triacetate), and polyethylene trephthalate polyester (Kodak trade-name: ESTAR).

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melcon s. lapina, mscrim FILMS & PAPERS Characteristics of B & W Films: Emulsion Speed Spectral Sensitivity Granularity or Graininess

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melcon s. lapina, mscrim FILMS & PAPERS Emulsion Speed ASA (American Standards Association) rating. This is expressed in arithmetical value. DIN (Deutsche Industrie Normen) rating, which is expressed in logarithmic value. ISO (International Standards Organization) rating. This is expressed in the combined arithmetical and logarithmic values.

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melcon s. lapina, mscrim FILMS & PAPERS Spectral Sensitivity Blue sensitive film – sensitive to UV rays and blue color only Orthochromatic film – sensitive to UV rays, to blue and green color. It is not sensitive to red color. Panchromatic film – sensitive to UV radiation to blue, green, and red light or all colors.

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melcon s. lapina, mscrim FILMS & PAPERS Spectral Sensitivity cont… d. Infra-red film – sensitive to UV rays, to blue, green, red light and infrared rays.

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melcon s. lapina, mscrim FILMS & PAPERS Granularity or Graininess This refers to the size of the metallic silver grains that are formed after development of an exposed film. Generally, the size of metallic silver grains are dependent on the emulsion speed of the film and the type of developing solution that is used in processing.

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melcon s. lapina, mscrim FILMS & PAPERS Granularity or Graininess cont… RULES to remember: The lower the emulsion speed rating of the film, the finer is the grain. The higher the emulsion speed rating of the film, the bigger are the grains. A film developer will produce a finer grain that a paper developer when used for film processing.

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melcon s. lapina, mscrim FILMS & PAPERS B. COLOR FILMS A color film is a multi-layer emulsion coated on the same support or base.

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melcon s. lapina, mscrim FILMS & PAPERS Main types of color film in current use Color negative film forms a negative (color-reversed) image when exposed, which is permanently fixed during developing. This is then exposed onto photographic paper to form a positive image. Ex: Kodacolor Color reversal film, also known as slide film, forms a negative image when exposed, which is reversed to a positive image during developing. The film can then be projected onto a screen. Ex: Kodachrome

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melcon s. lapina, mscrim FILMS & PAPERS C. Photographic Papers (Black & White) Photographic paper is exposed to light in a controlled manner, either by placing a negative in contact with the paper directly to produce a contact print, by using an enlarger in order to create a latent image, by exposing in some types of camera to produce a photographic negative, or by placing objects upon it to produce photograms. Photographic papers are subsequently developed using the gelatin-silver process to create a visible image.

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melcon s. lapina, mscrim FILMS & PAPERS Characteristics of a Photographic Paper Chloride paper – has a slow speed and is suited for contact printing. Bromide paper – has a fast speed and is recommended for projection printing or enlarging. Chloro-bromide paper – is a multi-speed and could be used in both contact printing and enlarging.

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melcon s. lapina, mscrim FILMS & PAPERS Exposure and development latitude Latitude is the degree or amount of which you can deviate from the ideal exposure or development without appreciable loss of print quality. 1. Exposure latitude Generally, photographic papers do not have a wide exposure latitude so exposure must be critical at all times.

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melcon s. lapina, mscrim FILMS & PAPERS 2. Development latitude Papers that do not change appreciable in contrast and image tone with reasonable variations in development has a good latitude. However, for best quality the developing time should be as near as those prescribed by the manufacturer.

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melcon s. lapina, mscrim FILMS & PAPERS Contrast Range or Grade In most photographic papers, the contrast range or grade are indicated by numbers – # 0 to 5 1. # 0 & 1 are used on over-exposed or low contrast negative. 2. # 2 are used on normal exposed or normal contrast negatives. 3. # 3 to 5 used in under-exposed or high contrast negatives.

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melcon s. lapina, mscrim FILMS & PAPERS Which Film to Use Film is available in variety of 'speeds'. The faster the film the more sensitive it is to light, and the shorter the exposure needed. Fast film produces a grainier image.

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melcon s. lapina, mscrim FILMS & PAPERS Which Film to Use cont… Film speed is measured on the ISO scale. A film rated as ISO 100 is four times slower than an ISO 400 film, and needs four times more light for the same shot.

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melcon s. lapina, mscrim FILMS & PAPERS Slow Film and Ultra-Slow Film – Slow films are not just used conditions. For the shot of the sculpture (left) a tripod was used and ISO 50 film. For the nightscape (right) ISO 100 film was used as the photographer wanted a long shutter speed to blur the moving lights.

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melcon s. lapina, mscrim FILMS & PAPERS

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melcon s. lapina, mscrim FILMS & PAPERS

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melcon s. lapina, mscrim FILMS & PAPERS Fast Film – Faster films, with a higher ISO rating, are needed in low light when faster shutter speeds are required, either to avoid camera shake or to freeze the action. In this shot, taken in fading sunlight, the photographer needed a shutter speed of 1/250 sec to freeze the jogger moving across the frame, and used ISO 400 film.

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melcon s. lapina, mscrim FILMS & PAPERS Super-Fast Film – The fastest films are designed for handheld use in low light conditions when the fastest shutter speeds may be required. For this motorcycle race on an overcast day the photographer needed shutter speeds of 1/1000 sec or over to freeze the action, and chose to use ISO 1000 film. The grain on such films is noticeable particularly in shadow areas and at bigger enlargements – but this is far preferable to blurred photographs.

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melcon s. lapina, mscrim FILTERS In photography, a filter is a camera accessory consisting of an optical filter that can be inserted in the optical path. The filter can be a square or rectangle shape mounted in a holder accessory, or, more commonly, a glass or plastic disk with a metal or plastic ring frame, which can be screwed in front of the lens.

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melcon s. lapina, mscrim FILTERS

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melcon s. lapina, mscrim FILTERS TYPES OF FILTERS Light Balancing Filter Color Compensating Filter Neutral Density Filter Polarizing Filter

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melcon s. lapina, mscrim FILTERS Light Balance Filter A filter used to change the color quality of the exposing light in order to secure proper color balance for artificial light films.

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melcon s. lapina, mscrim FILTERS Color Compensating Filter This is used to change the over-all color balance of photographic result obtained with color films and to compensate for deficiencies in the quality of exposing energy.

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melcon s. lapina, mscrim FILTERS Neutral Density Filter This filter is used when the light is too bright to allow the use of desired f-number or shutter speed with a particular film.

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melcon s. lapina, mscrim FILTERS Polarizing Filter It is used to reduce or minimize reflections on subjects like water glass, and highly polished surfaces.

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melcon s. lapina, mscrim EXPOSURE Exposure is simply a combination of the aperture and shutter speed. Thus, it is defined as the product of the total light intensity and the length of time it strikes the emulsion. Control of Cameras cont…

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melcon s. lapina, mscrim EXPOSURE cont… Exposure is subjective and errors in calculation will result to “overexposure” or “underexposure”. Proper exposure is dependent on: a. Film speed b. Lighting condition c. Type of subject Control of Cameras cont…

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melcon s. lapina, mscrim Light is a form of energy, and to understand light we begin with the electromagnetic spectrum which is basically a grouping of all electromagnetic radiation arranged according to the amount of energy contained in the radiation. Light: Its Characteristics & Sources

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melcon s. lapina, mscrim Visible light is a part of this electromagnetic spectrum that creates the sensation of light when it falls on the human eye. Light: Its Characteristics & Sources

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melcon s. lapina, mscrim Light: Its Characteristics & Sources

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melcon s. lapina, mscrim Light: Its Characteristics & Sources The properties of all electromagnetic radiation can be described by three inter-related terms. These are wavelength, frequency and energy. Since light is a part of this spectrum, it too can be described by these terms. Hence, it is important to understand these terms as a first step towards understanding light.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Wavelength Simplistically, we can think of light traveling as a wave. A typical wave form (e.g., ripples on the surface of water) has crests (or peaks) and troughs (or valleys). The distance between two consecutive peaks (or troughs) is called the wavelength, and is denoted by the Greek letter ? (lambda).

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melcon s. lapina, mscrim Light: Its Characteristics & Sources The wavelengths of visible light are measured in nanometers (nm) where 1 nm = 1 billionth of a meter (10-9 meters). The wavelength of visible light is between 400-700nm. The combined effect of the complete range of radiation between 400-700nm appears as white light to the human eye.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Rainbow Colors: Violet - 400 to 440nm Blue - 440 to 490nm Green - 490 to 540nm Yellow - 540 to 590nm Orange - 600 to 650nm Red - 650 to 700nm

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melcon s. lapina, mscrim Light: Its Characteristics & Sources 4 PHOTOGRAPHIC RAYS OF MODERN PHOTOGRAPHY X-rays – 1 to 30 nm UV rays – 30 to 400 nm Visible light – 400 to 700 nm Infrared rays – 700 to 1,000+ nm.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources PRIMARY COLORS OF LIGHT Red Green Blue

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melcon s. lapina, mscrim Light: Its Characteristics & Sources SECONDARY COLORS OF LIGHT Yellow Cyan Magenta

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melcon s. lapina, mscrim Light: Its Characteristics & Sources NOTE: White is the presence of all colors Black is the absence of all colors or the absence of light.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources NOTE: White is the presence of all colors Black is the absence of all colors or the absence of light.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources PRIMARY COLORS OF COLORING MATTERS Red Yellow Blue

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melcon s. lapina, mscrim Light: Its Characteristics & Sources BENDING OF LIGHT When traveling in open space, light travels in a straight line (186,000 miles/second). However, when light comes in contact with an object, it may be bended in the following manner:

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Reflection of Light Specular or Regular Reflection - If the reflecting surface is very smooth, the reflection of light that occurs is called specular or regular reflection.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Specular or Regular Reflection

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Reflection of Light cont… Diffuse or Irregular Reflection – When light strikes a rough or granular surface, it bounces off in all directions due to the microscopic irregularities of the interface.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Diffuse or Irregular Reflection

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Diffuse or Irregular Reflection

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Refraction It is the change in direction of a wave due to a change in its speed. This is most commonly observed when a wave passes from one medium to another.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources The straw seems to be broken, due to refraction of light as it emerges into the air.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Diffraction It is described as the apparent bending of waves around small obstacles and the spreading out of waves past small openings.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Diffraction cont… It is also described as the bending of light when it hits a sharp edge of an opaque object.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Examples of Diffraction The closely spaced tracks on a CD or DVD act as a diffraction grating to form the familiar rainbow pattern we see when looking at a disk; The hologram (a picture that changes when looked at from different angles) on a credit card;

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Kinds of Objects Transparent objects – allows sufficient visible light to pass through them that the object on the other side may be clearly seen. Translucent objects – allows light to pass, however diffuse it sufficiently that objects on the other side may not be clearly distinguished. In some cases the objects on the other side may be recognizable but sharp detail and outline are obscured.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Kinds of Objects cont… Opaque objects – so greatly diffuse the light that recognizing the object on the other side is very difficult if not impossible.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Sources of Light Natural Light Source Artificial Light Source

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Natural Light Source (Sunlight) Bright sunlight – a lighting condition where objects in open space cast a deep and uniform or distinct shadow. Hazy Sunlight – objects in open space cast a transparent shadow. Dull Sunlight – objects in open space cast no shadow.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Natural Light Source (Sunlight) Dull Sunlight Cloudy bright – objects in open space cast no shadow but objects at far distance are clearly visible. Cloudy dull – objects in open space cast not shadow and visibility of distant objects are already limited.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Artificial Light Source Light sources of this category are man-made and is divided into the continuous radiation and the short duration.

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melcon s. lapina, mscrim Light: Its Characteristics & Sources Forensic Light Sources UV Lamp LASER – Light Amplification through Simulated Emission of Radiation. Alternative Light Sources Forensic Light Sources

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melcon s. lapina, mscrim Developing, Printing and Enlarging CHEMICAL PROCESSING Black & White Processing – development, stop-bath, and fixation. Color Processing – development, stop-fix, and stabilizer.

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melcon s. lapina, mscrim Developing, Printing and Enlarging Development It is the conversion of latent image in an emulsion into visible image. 1. B & W Emulsion – reducing exposed silver halide crystals (black silver) into metallic silver. (Same reaction is found in photographic papers.) 2. Color Emulsion – Developed silver is replaced with cyan, yellow, and magenta dye.

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melcon s. lapina, mscrim Developing, Printing and Enlarging Stop-Bath The purpose of the stop bath is to halt the development of the film, plate, or paper by either washing off the developing chemical or neutralizing it.

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melcon s. lapina, mscrim Developing, Printing and Enlarging Fixation The fixer removes the unexposed silver halide remaining on the Photographic film or photographic paper, leaving behind the reduced metallic silver that forms the image, making it insensitive to further action by light. Without fixing, the remaining silver halide would quickly darken and cause severe fogging of the image.

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melcon s. lapina, mscrim Developing, Printing and Enlarging Fixation cont… The most common salts used are sodium thiosulfate - commonly called hypo - and ammonium thiosulfate, commonly used in modern rapid fixer formula.

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melcon s. lapina, mscrim Developing, Printing and Enlarging FILM PROCESSING It can be carried out in trays, tanks, or mechanized equipment. NOTE: Panchromatic materials – handled in total darkness. Blue films, orthochromatic films and printing papers – handled under a safelight.

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melcon s. lapina, mscrim Developing, Printing and Enlarging Equipment for Film Processing a. Tank or tray b. Developing reel c. Opener for film cartridge (pliers) d. Scissors to cut the tongue of the film e. Thermometer f. Timer g. Funnel

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melcon s. lapina, mscrim Developing, Printing and Enlarging Equipment for Film Processing cont… h. Photographic sponge i. Film clips for drying j. glass or plastic bottles (gallon size) for storing mixed solutions.

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melcon s. lapina, mscrim Developing, Printing and Enlarging

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melcon s. lapina, mscrim Developing, Printing and Enlarging

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melcon s. lapina, mscrim Developing, Printing and Enlarging DEVELOPER FORMULATION Typical component: 1. Solvent (water) 2. Developing agent 3. Preservative 4. Accelerator or activator 5. Restrainer

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melcon s. lapina, mscrim Developing, Printing and Enlarging D-76 Film Developer formula 1. Water 520C or 125 0F - 750 ml 2. Elon - 2 gm 3. Hydroquinone - 5 gm 4. Sodium Sulfite - 100 gm 5. Borax (granules) - 2 gm 6. Water to make - 1 li

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melcon s. lapina, mscrim Developing, Printing and Enlarging DEKTOL – Paper Developer 1. Water 520C or 125 0F - 500 ml 2. Elon - 311 gm 3. Hydroquinone - 12 gm 4. Sodium Sulfite - 4.5 gm 5. Sodium carbonate - 67.5 gm 6. Potassium bromide - 1 gm 7. Water to make - 1 li

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melcon s. lapina, mscrim Developing, Printing and Enlarging STOP-BATH Stop-bath can be plain water only with 28% glacial acetic acid.

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melcon s. lapina, mscrim Developing, Printing and Enlarging FIXING BATH FORMULA 1. Water 2. Dissolving agent 3. Preservative 4. Neutralizers 5. Hardeners

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melcon s. lapina, mscrim Developing, Printing and Enlarging Typical Fixing Formula: 1. Water 520C or 125 0F - 600 ml 2. Hypo - 240 gm 3. Sodium sulfite - 15 gm (anhydrous) 4. Acetic Acid (28%) - 480 ml 5. Boric Acid (crystals) - 7.5 gm 6. Potassium alum - 15 gm (fine granular) 7. Water to make - 1 li

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melcon s. lapina, mscrim Developing, Printing and Enlarging PHOTOGRAPHIC PRINTING Contact Printing Projection Printing or Enlarging

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melcon s. lapina, mscrim Developing, Printing and Enlarging Contact Printing It is a procedure of exposing photographic print materials while it is pressed in contact with the negative being reproduced.

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melcon s. lapina, mscrim Developing, Printing and Enlarging Projection Printing or Enlarging It is a type of printing where the image in a negative is optically projected or enlarged onto a print material for exposure to produce a picture image. The main equipment is Enlarger, the so-called camera in reverse.

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melcon s. lapina, mscrim Developing, Printing and Enlarging EQUIPMENT FOR PAPER DEVELOPING Three plastic trays – one each for the developer, stop-bath, and the fixer. (The size of the tray is determined by the largest prints size). Metal, plastic, or bamboo tong preferably with rubber ends to hold the prints.

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melcon s. lapina, mscrim Developing, Printing and Enlarging EQUIPMENT FOR PAPER DEVELOPING cont… Rubber (surgical) hand gloves. Timers Paper cutter A bigger tray or tank for washing prints.

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melcon s. lapina, mscrim APPLICATION TO POLICE WORK GENERAL APPLICATION Identification purposes Recording and preserving of evidences Discovering and proving of evidences not readily seen by the naked eye. Recording action of offenders For court exhibits For crime prevention

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melcon s. lapina, mscrim APPLICATION TO POLICE WORK Public information Police training

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melcon s. lapina, mscrim APPLICATION TO POLICE WORK SPECIFIC APPLICATIONS Identification Photographs Crime-Scene Photography

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melcon s. lapina, mscrim References Forensic Photography for Criminology Students and Practitioners by WAYNEFRED H. VILLARBA, Ph. D. Crim The Complete Idiot’s Guide to: Photography Like a Pro The Everything Photography Book by Eliot Khuner with Sonia Weiss

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melcon s. lapina, mscrim References John Hedgecoe’s 35mm Photography Merriam-Webster’s Collegiate Dictionary 11th ed. www.en.wikipedia.com www.youtube.com

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