The Zorki-4 is a real Russian classic manufactured by KMZ, the Krasnogorskij Mekhanicheskij Zavod Imeni S.A. Zvereva (the Krasnogorsk Mechanical Plant, Bearing the Name of S. A. Zverev). KMZ was, and still is, located in Krasnogorsk, a suburb of Moscow, and made all kinds of optical equipment, both civil and military. The Zorki-4 was manufactured from 1956 to 1973, and evolved out of the Zorki-3S. J.L. Princelle says, in his book, that 1.715.677 were produced over those seventeen years.   The Zorki family started off as copies of the Leica Screw series, like a lot of Russian cameras did. The basic pre-war Leica design was copied since the thirties (by FED) and after the war continued by KMZ in their Zorki series. 'Zorkij', by the way, means 'he who has acute vision' in Russian.   After a range of Zorki cameras during the forties and early fifties, KMZ finally cooked the Zorki range down to the one Zorki-4, which contained all the advantages of its predecessors, such as all the shutter speeds combined in one dial, a variable flash sync delay, and (for those days) a reasonable finish. And when the Zorki-4 was finally taken into production in 1956, it stayed so for seventeen years.   The thick body metal is cast aluminium, but the top plate with the viewfinder is made out of thin sheet metal which was pressed into shape. The Zorki-4 is skinned in fake leather.   Zorki 4 is the KMZ copy of the Leica II, it will in fact mount actual Leica L-mount lenses. The Jupiter-8 lens (a Zeiss Sonnar clone) it's very smooth to focus, though the lack of detents (click-stops) on the aperture wheel makes it easy to accidentally change the f-stop while focusing. If other lenses are used, with different focal lengths, you'll need to use an auxiliary turret viewfinder, the built-in viewfinder is of course strictly fixed for 50mm.   Taking photos with the Zorki-4 is a pleasant experience if you're used to cameras like these, but agonizing if you're not. There is no light meter, the shutter speeds are hard to set because of the uneasy going shutter speed dial, and you have to focus separately before each photo.   One important rule in using this camera it's ALWAYS cock the shutter before changing shutter speeds! Read the manual before even attempting to use the camera, the stuff about shutter speeds is both non-intuitive and critical to the proper operation of the camera. Changing speeds without tensioning the shutter can damage the shutter!     Zorki 4 Owner's Manual Zorki 4 Rangefinder Camera Instruction Booklet Zorki 4 Camera Operation Instructions