M42×1 mounting thread and mechanical back focal distance of 45.5
mm, which are designed for ZENIT type of cameras with focal plane
shutter.
HELIOS-44M lens should be screwed in or out by the lens mounting
ring only.
If an interchangeable lens has no automatic diaphragm mechanism,
the diaphragm should be handled manually.
When long focus lenses are used, a slight cutting of the left or
right edges of the image on negative is likely to take place. When
using lenses MTO-500 and MTO-1000 the camera exposure meter
can not be used since the outer mount of these lenses overlaps the
photocell window.
With the help of a special stand the camera can be used for making
reproductions of drawings, manuscripts, photographs and so on.
When making reproduction works, use should be made of extension
tubes by setting them between the camera body and the lens. In
so doing either one tube or a combination of some tubes can be
used.
When using extension tubes, the lens diaphragm should be operat-
ed manually and the automatic diaphragm lever should be set at
index "M".
CARE OF THE CAMERA
The camera should be handled carefully, kept clean and protected
from mechanical damage, moisture and sharp changes in tempera-
ture.
When using the camera in frosty weather (below -10°C), do not
keep the camera in the open air, keep it under your street-clothes,
taking it out only for the moment of photographing.
The photocell window requires special care. It should be kept clean
otherwise the exposure meter accuracy would be disturbed.
Keep the camera in a closed carrying case. In so doing the lens
should be capped and the shutter and self-timer should be re-
leased.
Do not touch the optical details with hands since this is likely to
damage their coating.
Clean the coated optical surfaces (except for the Fresnel lens which
is placed inside the camera) only from outside with a clean soft
piece of fabric or cotton, slightly moistened with rectified alcohol or
ether.
The Fresnel lens may be cleaned only with an air jet. Using wet
means of cleaning is not allowed.
ACP - Zenit-EM manual
http://cameras.alfredklomp.com/zenitem/manual/
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