JMC3003: Photography basics tutorial

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Basics of photography for Gaylord College classes

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A note about this tutorial:

A note about this tutorial Body Level One A note about this tutorial Body Level Two A note about this tutorial Body Level Three A note about this tutorial Body Level Four A note about this tutorial Body Level Five Some animations in this presentation are set to automatically appear and some are not. When you see this icon:click to advance the tutorial.

Click to begin:

Click to begin Body Level One Click to begin Body Level Two Click to begin Body Level Three Click to begin Body Level Four Click to begin Body Level Five This tutorial covers aspects of exposure. At the end, you should know:What is exposure.What are the three measures of exposure.What types of numbers represent each of the three.Core concepts covered: aperture, shutter speed, and ISO.

Basics of photography Exposure: the measures of light:

Basics of photography Exposure: the measures of light JMC 3003

Photography:

Photography Body Level One Photography Body Level Two Photography Body Level Three Photography Body Level Four Photography Body Level Five Photo by: Julie jones on iphone 4sAt the most basic level, photography is the capturing of light on a piece of media. In the analog days, that media was film. In the digital era, that media is a digital sensor that sends information to an SD card.

Photography:

Photography Body Level One Photography Body Level Two Photography Body Level Three Photography Body Level Four Photography Body Level Five Photo by: Julie jones on iphone 4sIn order to “take” a picture, the right amount of light needs to hit the film or sensor plane. Controlling that amount of light is called exposure. Remember, though, that exposure is capturing a range of light in a given view. This range includes the lack of light.Always remember: Photography is as much about shadows as it is about light.

Photography = light and shadows:

Photography = light and shadows Exposure is controlled in cameras in three ways: Photography = light and shadows Aperture Photography = light and shadows Shutter speed Photography = light and shadows Light sensitivity (used to be called “film speed”) Photo by: Julie jones on iphone 4s

Photography = light and shadows:

Photography = light and shadows Aperture = f-stop #s Photography = light and shadows Shutter speed = fraction of seconds #s Photography = light and shadows Light sensitivity = ISO #s Each are measured in numbers:Photo by: Julie jones on iphone 4s

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Title Text aperture The aperture of a lens is like the iris of your eyes. The iris of your eye opens “up” when you are in dark spaces and closes when you are in brighter spaces or, in this situation, looking at something bright like the fire.The camera is exactly the same, only cameras need to be “set” while our eyes adjust automatically.Photo by: JK PutnamNat Geo photo of the Month

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Title Text aperture In camera lens, an “open” aperture is a small number and a “closed” aperture is a large one. The standard range of f-stops runs from an open f 1.8 to a closed f 22.Image Source: GPS photography

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Title Text Shutter speed — is simply how fast the shutter opens and closes. It is measured by seconds. Image source: Exposure Guide1/120 = one-twentyth of a second 4/1 = 4 seconds

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Title Text ISO or film speed ISO is a measurement of light sensitivity for the media that captures the image. Image source: Apple keynoteIn the film days, you could buy fast and slow films with the ISO (or ASA) # on the package. In the digital era, ISO is a setting and its range is determined by the camera manufacture.

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Title Text Film speed or ISO Media’s sensitivity to light is a bit similar to people in that very sensitive ISO settings tend to be a bit “touchy.”

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Title Text Film speed or ISO Lower ISO #s are less sensitive to light, but the pixels are more stable and have a better quality. Image source: Exposure GuideHigher ISO #s are good for low light situations, but the trade off is “noisy” pixels. Notice the pixels in the night sky above the Golden Gate bridge. As ISO increases the blue pixels degrade and become noticeable.

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Title Text Body Level One Title Text Body Level Two Title Text Body Level Three Title Text Body Level Four Title Text Body Level Five The take away. Light in cameras are controlled by:Aperture measured by f-stops examples: 4, 5.6, 16, etc. Shutter speeds measured by (usually) fractions of secondsexamples: 1/60 , 1/125, 1/1000, etc.ISO measured by increments of hundreds examples: 100 , 400, 800, etc.Image source: Apple keynote

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Title Text Body Level One Title Text Body Level Two Title Text Body Level Three Title Text Body Level Four Title Text Body Level Five JMC 3003: Photo Basics tutorials Next: The case against auto mode © julie jones, 2014© julie jones, 2014

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