The camera is equipped with “Industar-61”
lens with lanthanum optics.
The lens mount is fitted with the following
scales:
the diaphragm scale indicates changes of the
lens light diameter — rapidity of lens;
the depth-of-field scale which, when
focusing, indicates of the distance scale the
limits within which the range sharpness will be
satisfactory for each selected diaphragm value;
the distance scale serves for focusing the
lens. The scale designations correspond to the
distance from the object photographed to the
surface of the film in metres.
The camera is focused with the help of the
optical range-finder. In order to set the camera at
an accurate and proper focus first turn the ring
of the dioptric focusing, focus the view-finder
by your own sight (the dioptric focusing mecha-
nism provides a correction of ±2 diopters).
Then aim the camera at the object to be
photographed. In the center of the field of view
of the view-and-range-finder a disc differing in
colour is seen, in which the image will be
double.
By turning the distance ring of the lens align
the image into one. It is recommended to set the
camera approximately in the middle third of the
light field.
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