Mamiya-Sekor C 90mm F/3.8
Standard prime lens • Film era • Discontinued
- Announced:
- · 1974
- Production status:
- ● Discontinued
- Country of design:
- · Japan
- Original name:
- · MAMIYA-SEKOR C 1:3.8 f=90mm
- Class:
- · Slow 6x7 medium-format standard prime lens
- · Professional model (Top class)
- System:
- · Mamiya RB67 (1970)
Abbreviations
| C | Multi-layer anti-reflection coating is applied to the surfaces of lens elements. This anti-reflection coating increases light transmission, eliminates flare and ghosting, and maintains color consistence among all lens models. |
Model history (3)
| ■Mamiya-Sekor 90mm F/3.8 | A | 7 - 6 | ⌀77 | 1970 ● | ||
| ■Mamiya-Sekor NB 90mm F/3.8 | A | 7 - 6 | ⌀77 | 1974 ● | ||
| ■Mamiya-Sekor C 90mm F/3.8 | A | 7 - 5 | ⌀77 | 1974 ● | ||
| —Mamiya-Sekor C 90mm F/3.8 Golden Lizard "RB67 11th Anniversary" | 1982 ● | |||||
Specification
| Optical design: | |
| Medium format 6x7 | |
| 90mm | |
| F/3.8 | |
| 7 elements in 5 groups | |
| Mamiya RB67 [111mm] | |
| 53.2° | |
| Diaphragm mechanism: | |
Diaphragm type: | Automatic |
Aperture control: | Aperture ring (Manual settings only) |
| Built-in leaf shutter: | |
Type: | Mechanical Seiko #1 |
Range of shutter speeds: | 1 - 1/400 + T |
Self-timer (V): | - |
Shutter speed control: | Shutter speed ring |
Flash sync mode: | M & X sync |
Flash sync terminal: | Yes |
| Focusing: | |
| <No data> | |
| 0.20m | |
| 1:2 | |
Focusing modes: | Manual focus only |
Manual focus control: | None; focusing from the camera |
| Physical characteristics: | |
| 805g | |
| ⌀?×73mm | |
| Accessories: | |
| Screw-type 77mm | |
| Screw-type round | |
| Not available |
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
All Mamiya Sekor Lenses from the 50 mm wide angle to the 360 mm telephoto, oftering excellent image quality and superb resolving power, are equipped with an automatiс aperture control feature. The lenses also have a depth of field preview lever so that the depth of field at any aperture setting is plainly visible. The between the lens shutter (Seiko #1) synchronizes with electronic flash at all shutter speeds. Lenses are quickly and positively interchanged with the RB 67 bayonet safety ring system.
The 90mm lens is the equivalent of the 45mm lens used with 35mm cameras. It has a focal length which may be termed "normal" to the 6 x 7 format. While it may often be referred to as a standard lens among standard lenses, the fact that it can be used to obtain close-ups with a magnification of 1/2x without attachments amply demonstrates its versatility.
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 90mm F/3.8 special editions (1)
Other standard prime lenses in the Mamiya RB67 system
| ■Mamiya RB67 mount (3) | |||||||||
| Mamiya-Sekor 90mm F/3.8 | A | 7 - 6 | ⌀77 | 1970 ● | |||||
| Mamiya-Sekor NB 90mm F/3.8 | A | 7 - 6 | ⌀77 | 1974 ● | |||||
| Mamiya K/L 90mm F/3.5 L | A | 8 - 7 | 0.45m | ⌀77 | 1990 ● | ||||