Rollei AFM 35, Operating Instructions Manual, Page: 20 / 52

20
What is depth of field?
›
Any optical system can actually focus on only one
distance. However, the size of the lens aperture (f-
stop) has a decisive effect on the depth range which
the eye will still accept as “sharp”. The following
optical laws apply:
›
A large aperture results in shallow depth of field, a
small one in great depth of field.
›
The longer the focusing distance, the greater the
depth of field. The shorter the distance, the shallower
the depth of field.
›
Depth of field is shallower in front of the plane of best
focus than behind it.
See also the depth-of-field table on p. 50.
DEPTH OF FIELD
›
Turn the main dial to the desired aperture and make
sure it engages one of its click stops. Note that
proper exposure is not guaranteed in any
intermediate position.
›
Press the shutter release halfway, making sure that
the green focus indicator lights (not so the red
warning LED!), and press the shutter release softly
all the way.