8 depth of field – Phase One 645 AF User Manual
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Depth of field
Depth of field (D.O.F.) is defined as the zone of sharpness before and
behind the plane of focus. It depends on distance to subject, focal
length of lens, aperture setting and distance the lens is focused at.
In addition to visual observation via the depth of field preview button,
the D.O.F. can be determined by using the depth of field scale on each
lens. The f/stop numbers appear on both the right and left side of the
white index mark in the center of the scale. Simply read the figures
which appear above the f/stop numbers on the distance scale of the
lens. (see illustration below)
Depth of Field Preview Button
When the preview button is pressed in, the depth of field for the aperture
set on the camera can be checked by looking through the viewfinder.
After focusing, press the preview button. The diaphragm will be stopped
down to the set aperture.
NOTICE:
While operating the preview button,
you cannot release the shutter
When the aperture is open (the subject depth is small)
When the aperture is stopped down (the subject depth is large)
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