Mamiya 645DF, User Manual

Page: 99 / 149

99
9.12 Depth of Field
Depth of field (DOF) 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 DOF 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.
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 is stopped
down to the set aperture.
Web Resources
http://www.cambridgeincolour.com/tutorials/depth-of-field.htm
http://en.wikipedia.org/wiki/Depth_of_field
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)
1.5
22 22 11 11 4 4
1.5 1.2 2
5 4 7
ft
m