Mamiyaflex C The original C Professional was launched in 1956/7, and is very rare, with production rapidly swithched to the improved C2 (right). It is distinguished by having only one focus knob (usually on the right, although I believe some left-handed ones were made.
Lens here is Sekor 80mm f2.8 (silver)
Seikosha-MX Shutter 1 to 1/400
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Mamiyaflex C2 The C2 was launched in 1958, improved mainly by two focus knobs rather than one, by a removable hood and the Seikosha-S shutter on the standard lens. Rack extension/ bellows focus down to 7" transformed the TLR market. SHutters were also improved.
Lens here is Sekor 80mm f2.8 (silver)
Seikosha-S Shutter 1 to 1/500
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Mamiya C3 The C3XX series differs from the C2xx chiefly by having a film-advance crank, rather than a knob. Auto exposure prevention. This is the first of the long-lived series, made c 1962
Lens here Sekor 80mm f3.7 (black)
Copal Shutter 1 to 1/500
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Mamiya C33 The C33 series succeeded the C3 c 1965. Film-advance crank now tensioned the shutter. Automatic parallax compensation.
Lens here Sekor 135mm f4.5 (black)
Seiko Shutter 1 to 1/500
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Mamiya C22 The first of this series was the C2, succeeding the Mamiyaflex C. The C22 (1966) is a lighter body with knob advance. 120/220 backs available.
Lens here Sekor 80mm f2.8 (silver), with Seikosha-S Shutter 1 to 1/500
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Mamiya C220 Followed the C22 (1968). Small crank on wind knob. Single back takes 120/220 film. Later (1982) succeeded by a C220f with minor improvements.
Lens here Sekor 180mm f4.5 (silver), with Seikosha-S Shutter 1 to 1/500
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Mamiya C330s Last of the line (1983) after intermediate C330f. Lighter body, parallax indicator in viewfinder. Still widely used, top-quality camera. The linked page (click thumbnail) has a picture of a strange "Special Edition" of this camera.
Lens here Sekor 55mm f4.5 (black) with Seiko Shutter 1 to 1/500
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