HOW
TO
ASCERTAIN
THE
DEPTH
OF
FIELD
------------------...,
. \.
On
the side
of
the lens barrel
is
the preview
button. Pressing down this lever which is
un-
related to the automatic diaphragm mechanism
of
the lens, temporarily stops down the lens
to the preset aperture.
This
permits ascertain-
ing through the viewfinder the actual
depth
of
field
at
that
aperture value.
This checking can
of
course be done more
easily by magnifying the viewfinder's image.
This appl
ies
particularly
to
copying.
By
inter-
changing the camera's viewfinder
with
the
critical focuser VF3,
the
image can be viewed
more critically through its high-power magni-
fier.
At
the
center
of
the
lens barrel, facing up,
is
the
depth-of-field scale which indicates
the
depth
of
field
at
a glance.
The
picture
shO\\·s
the
focus adjusted
to
2 meters, indicating
that
the
range in which sharp images can be obtained
extend fr
om
1.75
to
2.5 meters
at
f/8
aperture
and about 1.5
to
3 meters
at
f/16.
39
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