Also, BelOMO produced a "laboratory" "Zenit-ET" (photographic recorder), designed for microphotography - photography using an optical microscope. The difference from amateur cameras is the only exposure "B", no self-timer, no pentaprism, no exposure meter. The sighting was carried out through a fixed shaft with an eyepiece. Focusing screen - frosted glass.Specifications
The type of photographic material used is 35 mm perforated film 35 mm wide (film type 135) in cassettes. Frame size - 24 × 36 mm.
The case is a die-cast aluminum alloy, with an opening rear wall, on late models there is a hidden lock.
Cocking of the shutter and film rewind. Rewind of a roulette type.
The shutter is mechanical, focal-plane with horizontal movement of the cloth curtains. Shutter speeds are 1/30, 1/60, 1/125, 1/500 second and "B". Synchronization speed with electronic flash - 1/30 s.
Central sync terminal "X", cable sync terminal.
Standard lens:
Industar-50-2 3.5 / 50
"Helios-44-2" 2/58 (with preliminary installation of the diaphragm)
"MC Helios-44-3" 2/58 (with a pre-set aperture) - a lens with a modified frame
"Helios-44M" 2/58 - on models with a "jumping" diaphragm drive
"Helios-77M-4" 1.8 / 50 - on some models with a "jumping" diaphragm drive
Lens mount type - M42 × 1 / 45.5 threaded connection.
Focusing screen - Fresnel lens with frosted ring and micro-raster.
Unpaired selenium exposure meter, film sensitivity range 25 - 400 units. GOST. On models without an exposure meter, a calculator is installed to approximate exposure based on weather symbols.
Mechanical self-timer.
The camera has a 1/4 '' threaded side tripod socket.Lens "MC Helios-44-3"
A variant of the "Helios-44-2" lens with a modernized frame. Produced only by the Belarusian plant MMZ from 1992 to 1993, without agreement with the copyright holders at KMZ. The frame design is unchanged, but its external elements are improved in terms of ergonomics: the width of the focusing ring and both preset aperture rings have been increased. Produced with multilayer achromatic enlightenment with a green tint. This is the only version of the Helios-44 lens with a manual diaphragm, equipped with this type of coating. However, the poor blackening quality of the inner surfaces and the 8-blade diaphragm negated the anti-reflective effect, increasing light scatter.