Mamiya Sekor C 127mm f/3.8 (Unknown)

A medium format standard lens with leaf shutter, made in Japan for the Mamiya RB67 system

Overview

This is the Mamiya Sekor C 127mm f/3.8, a standard lens designed for the Mamiya RB67 camera system. It's part of the Sekor C series and is compatible with both RB67 and RZ67 models, including the Pro S and Pro SD variants. Manufactured in Japan, the lens features a built-in leaf shutter and was used by photographers with film types like Kodak Tri-X, including in locations such as Cornwall.

Specifications

Focal length	127mm
Maximum aperture	f/3.8
Filter thread	φ77
Shutter speed range	1/400s to 1s, Bulb
Compatibility	For RB67 RZ67, RB67 Pro S SD
Lens mount	Mamiya RB67 lens mount
Lens type	Standard Lens, MF Lens

Design

The lens is part of the Mamiya-Sekor C series and marked "LENS MADE IN JAPAN," indicating Japanese manufacture. It includes a leaf shutter within the lens assembly, a hallmark of the RB67 system design.

Market

Used units have been listed at $149.99, while complete camera and lens sets have sold for 500 euros. Some users report internal haze or fog on the lens elements as a known issue.