Depth Of Field - Pentax P3 Instruction Manual

DEPTH OF FIELD
Depth of field is the area of acceptable
sharpness in front of and behind the point of
focus. The depth of field becomes progressively
greater as the lens opening becomes smaller.
The distance at which the lens is focused also
affects the depth of field: it increases as you get
further away. The focal length of the lens is
another factor to determine the depth of field.
The shorter the lens, the greater the depth of
field.
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