FOCUSING THE LENS FOR IMAGE SHARPNESS
58mm HELIOS:
Focusing should be done with the diaphragm aperture opened at maximum. For this purpose
the diaphragm ring of the 58mm Hellos should be turned counter-clockwise to its full extent. Aim the lens at the
photographed object Observe through the viewfinder eye-piece: turn the lens focusing ring until a sharp image
appears on the ground glass. After focusing, the lens is instantly stopped down by turning the diaphragm ring
clockwise to its full extent, i.e. to its preset figure.
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50mm INDUSTAR:
When photographing with the 50mm Industar lens (which has no pre-set diaphragm), the
aperture setting ring of the lens is set after the focusing is done. In situations where you want to photograph a
number of objects disposed at different distances: use the depth-of-field scale. The depth-of-field scale is
symmetrically arranged on both sides of the index and corresponds to diaphragm values After the camera is
focused you Can read off the depth of field for a chosen aperture by noting the limits of the depth-in-field scale
on both sides of the index on the distance scale for the aperture setting selected. For example: when the lens is
focused at 10 ft and f:11 aperture is selected. the image will be sharp in limits from 8ft to 40ft.
FLASH SYNCHRONIZER
For photographing in conditions with poor illumination, you should use a flash gun. For this- purpose the Zenith
B camera is fitted with a special device which synchronizes flash to coincide with the shutter operating time. To
switch on a single action flash bulb: set the synchronization setting lever against index "M". When operating
with an electronic flash gun, the synchronization setting lever should be set against index "X". Only one
exposure time of 1 /30th sec. may be used in the Zenith B camera: when photographing with either flash bulbs
or electronic flash. Hand exposure ''B' is not recommended when using flash bulbs: a considerable amount of
stray light (after flash) enters the camera with resulting over exposure.
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