Depth Of Field - Pentax P5 Manual

DEPTH OF FIELD
aperture.
The minimum aperture (for example f/22) gives you
the greatest depth-of-field, or area in focus.
The maximum aperture (for example f/1.7) gives
you the smallest depth-of-field. When you vary
aperture value, the range "in focus" changes
accordingly, so that you can create different
photographic effects in your pictures. As illustrated
in the pictures on the right (examples of f/1.7 and
f/22), the distance range in focus can be confirmed
by the depth-of-field scale on the lens.
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