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16. Distance Scale 17. Depth-of-field
Distance from the film plane to the subject
can be determined by the distance scale (A).
Each lens features different distance scale
curves as pictured above. The figure on the
distance graduation
(B)
which align with the
curve indicates the distance to the subject.
For example, if the distance graduation and
the curve are as shown in the photo after
focusing with the 127mm lens, distance to the
subject is
1.5m
(5ft).
The focusing screen
1. Set the desired aperture by turning the
aperture scale ring and then adjust the focus.
2. Depress the depth-of-field preview lever
(A) and the depth-of-field can be observed on
the ground glass focusing screen.
Upon removing your finger, the lever will
return to its original position and the lens aper-
ture will fully reopen.
The curve for each lens is marked with a
white dot. Since the dot coincides with the
right-hand lens indicator, use it to quickly find
the curve on the scale for the lens used.
Using the depth-of-field scale
1. Turn the distance scale lever and align
the figure representing the focused distance
with the center index on the depth of field
scale.
2. The two distances (on both sides of the
center index) opposite the same figures as the
actual lens aperture on the depth-of-field scale
are the near and far limits of depth for a given
distance and lens aperture.
For example, when photographing a subject
5 meters away with the
127mm
lens at an
aperture of f/32, objects from about 3 to 13m
will be in focus.
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