Mamiya 90mm f/3.8 Sekor C Lens (1974)
A standard prime lens for the Mamiya RB67 medium format camera system, introduced in 1974.
Overview
This is a fixed focal length prime lens made by Mamiya, designated for use with the RB67 camera system. It was announced in 1974 and is now discontinued. Designed for medium format photography, it covers the 6x7 image area and functions as a standard lens within that format. The lens uses a bayonet mount and includes a built-in Seiko #1 leaf shutter with a speed range from 1 second to T (time),
Specifications
| Maximum format | Medium format 6x7 |
| Focal length | 90mm |
| Speed | f/3.8 |
| Lens construction | 7 elements in 5 groups |
| Mount | Mamiya RB67 |
| Shutter | Seiko #1 lens shutter |
| Shutter speed scale | T, 1 to [range incomplete] |
| Product type | Standard prime lens |
| Production status | Discontinued |
| Announced | 1974 |
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