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Abbreviations

Model history (3)

Specification

Sources of data

• Interchangeable lenses for Mamiya RB67 instructions.
• The photograph. Mamiya RB67 Pro S booklet.
• Mamiya RB67 Pro S price list by Bell & Howell (1975).
• Mamiya RB67 Pro S booklet (1977).
• Mamiya RB67 Pro-S booklet.
• Mamiya RB67 Pro-S instructions.

Manufacturer description

The design and operating controls of all the lenses are standardized, and the operation of interchanging lenses is the same for all lenses. With the exception of the filters for the 37mm f/4.5 and the 500mm f/8 lenses all filters are the 77mm screw-in type - a great help in keeping the camera bag uncluttered. In addition to a convenient depth-of-field preview lever that releases the automatic diaphragm, Mamiya-Sekor interchangeable lenses also feature a depth-of-field scale. This scale works in conjunction with the floating lens element system, a particularly rare feature in medium-format wide-angle and macro lenses, and contributes greatly to improved close-range photographic performance.

All Mamiya-Sekor C interchangeable lenses are supplied with Seiko #1 leaf-type lens shutters (with speeds of T and 1 sec. - 1/400 sec, with full M-X flash synchronization). The advantages of this type of lens shutter system - which permits high-speed synchronization with any flash for day-light synchro-sunlight applications - are well known to all professional photographers.

The rubber lens hoods supplied with each lens are very effective, and may be used together with the accessory sun shield. Since the sun shield's angle and direction can easily be changed at will, bright, extraneous light can be prevented from entering the lens.

The 127mm f/3.8 corresponds to a 63.5mm lens in the 35mm format. It has a rather narrow picture angle for a standard lens, the result of a newly developed Mamiya concept. The fact that today there are 100-105mm lenses available for 6 x 6 cameras is because other companies have followed Mamiya's lead in this area. The 127mm f/3.8 can be used in the same way as the 90mm f/3.8 lens, and finds applications in close-ups, portraits and product photographs because it produces minimal subject distortion. For a test of the uniqueness of Mamiya's lenses, this is probably the best one to try.

Mamiya-Sekor C series

The second generation of lenses designed for Mamiya RB67 series medium format 6x7 SLR cameras. Introduced with the Mamiya RB67 Professional S in 1974.

• New barrel design;
• Mechanical Seiko #1 leaf shutter;
• Fully synchronized for M- and X-settings so that you can work with flash at all shutter speeds;
• Fully automatic diaphragm;
• Multi-layer anti-reflection coating;
• Standardized 77mm filter thread mount for optimized handling with accessories (except the 37/4.5 fisheye and 500/8 lenses).

Mamiya-Sekor C 127mm F/3.8 special editions (1)

• Mamiya-Sekor C 127mm F/3.8 Golden Lizard "RB67 11th Anniversary" - 1982

Other short telephoto prime lenses in the Mamiya RB67 system