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Japanese TLR
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120 film (prewar and wartime)
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6×6cm
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Elmoflex | First Reflex | Kiko Flex | Lyra Flex | Minoltaflex | Minoltaflex Automat | Minoltaflex military prototype | Nōman Flex | Ostenflex | Prince Flex | Ricohflex (original) | Ricohflex B | Rollekonter | Roll-o-Frex | Rorter Ref | Rorterflex | Sakura-flex | Simpuflex | Starflex | Taroflex | Valflex | Yokusanflex
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120 film (postwar)
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6×7cm
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Koni-Omegaflex M
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6×6cm A–L (edit)
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Accuraflex | Aires Automat | Airesflex | Aires Reflex | Akumiflex | Alfaflex | Alpenflex | Amiflex | Autoflex | Beautyflex | Bikor-Flex | Bioflex | Companion | Copenflex | Cosmoflex | Crown Flex | Crystar Flex | Crystar 25 | Dorimaflex | Dorisflex | Easternflex | Echoflex | Eicaflex | Elbowflex | Elegaflex | Eleger Reflex | Elicaflex | Elizaflex | Elmoflex | Firstflex | Fodorflex | Fujicaflex | Geltoflex | Gnoflex | Graceflex | Halma Auto | Halma Flex | Hobiflex | Honorflex | Isocaflex | Itohflex | Kalloflex | Kallovex | Koniflex | Krimsoflex | Larkflex | Laurelflex | Luminaflex | Lustreflex | Lyraflex
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6×6cm M–Z (edit)
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Magniflex | Malcaflex | Mamiyaflex I | Mamiyaflex II | Mamiyaflex Automat A | Mamiya C | Mananflex | Manonflex | Marioflex | Metascoflex | Middl Flex | Mihamaflex | Mikono Flex S, P | Minolta Autocord | Minoltacord | Minoltaflex Automat prototypes | Minoltaflex II, III | Minoriflex | Molforeflex | Monade Flex | Morrisflex | Nikkenflex | Nikoflex | Ofunaflex | Olympus Flex | Oplenflex | Oriflex | Orionflex | Osiroflex | Pigeonflex | Princeflex | Prince Junior | Prinz Auto | Prinz Flex | Rectaflex | Ricohflex III–VII, Super, Holiday, Million | Ripeflex | Rolex | Ruvinalflex | Sanonflex | Selcaflex | Silverflex | Starflex | Sunflex IV | Superflex | Toyocaflex | Tsubasaflex | Tubasaflex | Veri Flex | Wagoflex | Walzflex | Welmyflex | Yashica-A, B, C, D, E, 635 | Yashica-Mat, EM, LM, 12, 24, Mat-124 | Zenobiaflex
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127 film
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4×4cm
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Cordlef | Olympus Eye 44 | Haco-44 | Halma 44 | Kino-44 | Laqon-44 | Minolta Miniflex | Primo Jr | Prinz 44 | Ricohmatic 44 | Ricoh Super 44 | Sawyer's Mark IV | Tower 44 | Tower 44B | Toyoca-44 | Walz Automat 44 | Yashica-44, 44A, 44LM
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35mm film
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24×36mm
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Haco 35 | Hulda 35 | Samocaflex 35 | Toyoca 35 | Yallu Flex
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No-need-darkroom
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28×40mm or 3×4cm
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Light-Go | B Light-Go | Maruso Camera | Meikai | Meisupi
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Subminiature
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20mm film
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Mycroflex
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17.5mm film
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Gemflex | Sun
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Japanese medium format SLR and pseudo TLR ->
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Other Japanese 6×6, 4.5×6, 3×4 and 4×4, 4×5 and 4×6.5 ->
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The Gemflex or Gem Flex is a subminiature twin-lens reflex camera made by Shōwa Kōgaku Seiki (昭和光学精機)[1] in November 1949. (It was advertised in Japanese camera magazines dated February to June 1950.)
The Gemflex uses paper-backed 16mm film, for a frame size of 14×14mm. It has the same layout as that of a conventional 6×6 TLR, with the viewing lens above the taking lens. It is a genuine TLR, with the viewing and taking lens moving together. The taking lens is a 25mm f/3.5 "Gem". The shutter has three speeds (25, 50, 100) as well as bulb. Film wind and focusing knobs are on the right.
The nameplate reads GEMFLEX with the "G" and "F" larger than the other letters. At the center of the outer cover of the viewing screen (visible from the front when the cover is open for use) is a stylized "SK" monogram.
A 1950 advertisement[2] does not mention the manufacturer but describes the camera as being distributed by Miura Shōji (三浦商事), of Ginza.
Notes
Sources / Further reading
In English:
In Japanese: