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r
. The smaller the aperture opening becomes
(the
greater the F figure becomes),
the greater the
d e p t h o f f i e l d w i l l b e .
. The depth of field becomes
shorter for a longer
focal distance and greater for a shorter focal
d i s t a n c e l e n s .
. The depth of field extends greater into the
background
than into the foreground.
. The Rokkor lenses with the completely
automatic
diaphragms
are always wide open before and
after a picture is taken. The viewfinder,
there-
fore, is bright and the depth of field can be
checked only by pressing down the diaphragm
lever after pre-selecting
the desired aperture.
36
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