CS 39J: Session 5
http://inst.eecs.berkeley.edu/~cs39j/session05.html
15 February 2007
General Notes:
Depth of field is affected by:
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Focal length: Long focal has less depth of field, more blur (also causes a compressed perspective appearance).
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Aperture: The bigger the aperture (smaller f-number for a given focal length), the shallower depth of
field.
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Focus distance: being close to the subject creates a shallow depth of field; focusing
on a distant object creates a large depth of field, so using a zoom
lens causes a compressed perspective and a shallow depth of field.
More details and equations to calculate depth of field can be found here.
Motion Blur vs. Focal Blur:
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Motion Blur: the result of a moving subject being photographed
at a relatively slow shutter speed. The light from a point on a moving subject is recorded
at different points in the image.
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Focal blur: the degree of focus of the foreground and background relative
to the subject.
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