CS 39J: Session 5
http://inst.eecs.berkeley.edu/~cs39j/session05.html
29 September 2006
General Notes:
Three aspects that affect depth of field:
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Focal length: A long focal length causes a compression of field (less depth
of field, more blur)
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Aperture: The bigger the aperture (smaller f-number), the shallower depth of
field.
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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.
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 slow shutter speed: the film maintains a "persistance of exposure"
for the given interval of time that the shutter is open. It seems, however,
the limitations of the medium dictate that time be compressed to an instant,
any light collected off of a moving subject stripped of that very thing
which bears its motion, the traces of an evolving image upon a static
medium.
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Focal blur: the level of focus of the foreground and background relative
to the subject.
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