KMZ made TWO types of half-frame cameras. While they both produced 18x24mm images, one style used standard, perforated, 35mm-wide film for vertical images, while the other used unperforated, 21mm-wide film for horizontal images. The former were for civilian use; the latter for Soviet espionage purposes.
See Zenit MT1
(1979) Not to be confused with the Zenit MF-1 (see NKVD & KGB cameras, above), this is a modified Zenit 19 -- which is a full-frame camera. The MT-1 came in different "styles", for example, some have a 42mm screw mount while others (like this one) has a breech-mount. Just the same, the camera was designed for endoscopic, medical photography. While all stypes have "B" exposure setting, some had a top speed of 1/500, while others had 1/1000. Cameras can be found with various prime lenses of 30mm f3.5 or 50mm -- some with fixed-focus, and/or fixed aperture. Other lenses could be used, as well. Unlike the Zenit 19, the Zenit MT-1 lacks a meter, and some have a data back. It is often called the "Surprise" -- I guess that tells us where the doctors inserted it!!!
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