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DEPTH OF FIELD
Depth of field refers to a zone extending in front of
and behind the plane of sharpest focus. Within this
zone
blur (or unsharpness
of the image) will be
negligible and everything can be accepted as in sharp
focus. Depth of field extends a greater distance behind
the subject in focus than in front. Depth of field
depends on three factors: focal length of the lens,
lens-to-subject
distance
and
taking aperture.
The
smaller the aperture and the shorter the focal length
of the lens, the greater the depth of field (for example,
wideangle lenses have more depth of field than tele-
photos). Also, the closer the subject, the smaller the
depth of field. These three factors can be adjusted
independently or in combination to give the photo-
gtapher creative control over the final picture.
Depth-of-Field Preview Button
The depth-of-field preview button located on top of
the Nikkormat lets you check depth of field before
shooting and make
desired
adjustments. Press the
button and the lens stops down to the preselected
aperture to allow you to see how much background
or foreground is in or out of focus.
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