Depth-Of-Field - Mamiya M645 Super User Manual

Depth-of-field refers to the total area
(foreground and background) which
will appear in sharp focus. The area of
sharpness (depth-of-field) depends
upon the distance the lens is focused
at, the f/stop (or aperture) being used,
and the focal length of the lens.
The area that will appear sharp can be
determined as follows:
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1. Depth-of-field can be determined
by referring to the Depth-of-field
Scale engraved on the lens.
For example, with the 60mm f/2.8N
lens focused at 10 ft. (3m) and the
Aperture Ring set to f/22, the Depth-
of-field Scale reveals that every-
thing from about 7ft. (2m) to about
20 ft. (6m) will appear sharp.
2. The lens can also be stopped down
to the preselected aperture for
direct viewing of the depth-of-field
by using the AM Lever on the lens.
To do so, move the lever so that "M"
(manual) is visible. When the lens
is set to "M" you can take a picture
observing the depth-of-field in the
finder.