Mamiya M645

The Mamiya M645 is the first series of 4.5×6 SLRs made by Mamiya. It features an electronic shutter. The finder and screens are interchangeable, but there is no magazine back, only pre-loadable film inserts. This made it easy to preload onto less expensive film magazines, but no mid-roll change is permitted. Up to 15 frames can be captured onto a 120 roll film. All the M645 models covered here share the same accessories (finders, screens, lenses, grips and inserts). The lenses and inserts (but not the viewfinders) can also be attached on later manual-focus cameras such as the M645 Super.

M645

The original M645 appeared in 1975. It has knob advance and shutter speeds from 8s to 1/500. It sports a mirror lockup and double exposure lever. Flash sync is 1/60 sec.

M645, original model image by Voxphoto (Image rights)

M645 1000S

The M645 1000S (1976) adds the 1/1000 top speed, a selftimer, a depth of field preview button and other details.

M645J

The M645 J (1979) is like the original model with shutter speeds from 1s to 1/500 but with the mirror lockup feature removed. The J is for Junior. It also lacks the upper shutter-release button of the other M645 models. It was only made for export.

M645J image by Drew Wertheimer (Image rights)

System

PD metering prism finder image by Rachel Rayns (Image rights)

waist level sport finder image by Studioesper (Image rights)

Lens original C C 35mm f3.5C C 45mm f2.8C C 55mm f2.8C C 80mm f1.9C C 80mm f.2.8C C 110mm f2.8C C 150mm f2.8C C 150mm f4C C 210mm f4C C 300mm f5.6C C 500mm f5.6C Zoom C 75-150mm f4.5 C 105-210mm f4.5 Special C 24mm f4 fisheye C 50mm f5 shift C 70mm f2.8 lens shutter C 80mm f4 Macro C 120mm f4 macro C 145mm f4 soft focus RX 500mm f8 reflex

Lens Newer C 35mm f3.5N C 45mm f2.8S C 45mm f2.8N C 55mm 2.8N C 70mm 2.8E C 80mm f1.9N C 80mm f2.8N C 110mm f2.8N C 210mm f4N C 300mm f5.6N C 500mm f5.6N Zoom C 55-100mm f4.5N Lens Shutter A 55mm f2.8N/L A 80mm f2.8N/L A 150mm f3.8N/L APO A 300mm f2.8 APO Special C 80mm f4N macro

View finder Prism finder AE finder CdS finder PdS finder Waist level sports finder Focusing screen 1 Microprism - standard screen 2 Matte - closeup, macro, no focus aid 3 Checker - grid pattern 4 Rangefinder - wide angle 5 Rangefinder - center split 45 angle spot Grip pistol left hand power drive

Specifications

	M645	M645 1000S	M645 J
Introduction	1975	1976	1979
Type	6cm × 4.5cm electronic focal plane shutter single lens reflex camera
Film back	integrated w/ removable film magazines
Film	120 film magazine 15 exposures 220 film magazine 30 exposures
Finder	interchangeable (Prism, AE, CdS, PD or waist-level/sports finder)
Focusing screen	interchangeable (Microprism, Matte, Checker, RF Wide, RF Spot)
Focusing	helical focusing built into each lens.
Mirror	instant return, automatic mirror system
Mirror Lock Up	Yes		No
Shutter	Moving Coil electronic focal plane shutter
Shutter Speeds	B, 1 to 500	B, 1 to 1000	B, 1 to 500
Shutter release	2		1
Multiple exposure	Yes multi exposure knob
Film winding	Removable, knob with built-in collapsible crank
Power	1x 6V silver-oxide PX28

Bibliography

• Lewis, Gordon, ed. The History of the Japanese Camera. Rochester, N.Y.: George Eastman House, International Museum of Photography & Film, 1991. ISBN 0-935398-17-1 (paper), 0-935398-16-3 (hard). P.147.
• McKeown, James M. and Joan C. McKeown's Price Guide to Antique and Classic Cameras, 12th Edition, 2005-2006. USA, Centennial Photo Service, 2004. ISBN 0-931838-40-1 (hardcover). ISBN 0-931838-41-X (softcover). P.647.
• Sugiyama, Kōichi (杉山浩一); Naoi, Hiroaki (直井浩明); Bullock, John R. The Collector's Guide to Japanese Cameras. 国産カメラ図鑑 (Kokusan kamera zukan). Tokyo: Asahi Sonorama, 1985. ISBN 4-257-03187-5. Item 2172.

Links

General links

In French :

• M645 on www.collection-appareils.fr by Sylvain Halgand

In Spanish :

• Mamiya M645 in the website of Hugo Rodriguez

In Japanese:

• The 6×4.5 and 6×7 SLRs in the Camera Museum of the Mamiya official website, covers the M645, M645 1000S and M645 J
• Mamiya M645 at Asacame

Documentation and manuals

• Mamiya 645 Camera Manuals : Photo-Manuals.com by Ben Squire
• Mamiya M645 Instruction manual (PDF) at Orphan Cameras
• M645 1000S (PDF) at Mamiya Leaf