Depth Of Field Control; Maximum Depth Of Field - Pentax MV-1 Manual

in daylight or in brightly lit arenas and stadiums if you use a wide
maximum aperture. (This technique does not work in low-lighting,
as low lighting necessitates a slow shutter speed.)
Depth-of-Field Control: Depending upon the aperture in use, different
areas in front of and behind your subject will be in focus. This is
known as depth of field and its effect can be varied by changing
lens apertures. If you need to know the critical depth of fields refer
to the depth-of-field scale and tables on pages 26 and 27. Often,
however, you can get by if you remember the following.
Maximum Depth of Field: The depth of field becomes progressively
deeper as the lens is stop down to smaller apertures and is greatest at
minimum aperture. Thus, if you desire both your subject and
background to be in focus, use a small aperture such as f/11 and
f/16 (if the yellow LED Lights, take precautions against camera
shake). Small apertures are also useful for critical close-up work,
but for this, refer to a close-up photography guide.
Out-of-focus highlights: The depth of field becomes progressively
shallower at wide lens apertures, and is shallowest at f/2, f/1.7 or
f/1.4, depending upon which is the maximum aperture of your
lens. A shallow depth of field produces an out-of-focus effect
which highlights your subject. Provided the green LED remains
lit, you can obtain this effect by using a wide maximum aperture,
even on a sunshiny day.
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