Aperture, Depth of Field, and Focal Length

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Aperture, depth of field, and focal length:

Aperture, depth of field, and focal length PHOTOGRAPHY

Review of exposure:

Review of exposure http://www.photonhead.com/beginners/stops.php

Term to know: Depth of Field:

Term to know: Depth of Field the distance in front of and beyond the subject that appears to be in focus . This is primarily determined by the aperture setting and the length of your lens. The larger the aperture (or the smaller the f -number ) the more shallow the field will be. The smaller the aperture (or the larger the  f -number) the broader it will be.

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The smaller the aperture, the greater your depth of field will be. In other words, objects near and far will be in focus.

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The opposite is also true. The bigger the aperture size, the more restricted your depth of field becomes. Only objects close to you will be in focus.

What does this all mean? :

What does this all mean? By utilizing both your lens length and your aperture you can control how much is in focus. Generally when you are shooting portraits you want to blur out the background. The only time you don't want to use some sort of shallow depth of field is when you are shooting a landscape. Then you want to broaden your depth of field as much as possible.

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http://www.photonhead.com/beginners/shutterandaperture.php

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When using a shallow depth of field, you must be extremely careful when focusing.

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Here, the camera’s autofocus sees the trees in the background as the focal point instead of the people in the foreground.

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Focus on the subject of your image, press your shutter release button halfway down, then recompose your image and fully press the button.

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f2.8

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f32

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f2.8

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f18

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f2.8

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f32

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f5.6

Application:

Application So, if you want to blur the background, select a large aperture and if you want to keep it sharp, choose a small one.

Term to know: focal length:

Term to know: focal length Lenses with focal lengths less than 50mm are referred to as wide-angles – simply because they have a wider angle of view. Lenses with focal lengths greater than 50mm are known as telephotos, and these offer greater magnification thanks to their much narrower angle of view. the distance in mm from the optical center of the lens to the focal point, which is located on the sensor

How focal length affects depth of field:

How focal length affects depth of field At any given aperture, depth of field gets shallower as focal length increases and vice versa.

The shorter the focal length, the farther away 2 objects will appear. The longer the focal length, the closer together 2 objects will appear.:

The shorter the focal length, the farther away 2 objects will appear. The longer the focal length, the closer together 2 objects will appear.

Focal length reference table:

Focal length reference table Lens Focal Length Terminology Typical Photography Less than 21 mm Extreme Wide Angle Architecture 21-35 mm Wide Angle Landscape 35-70 mm Normal Street & Documentary 70-135 mm Medium Telephoto Portraiture 135-300+ mm Telephoto Sports, Bird & Wildlife

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