Mamiya Mamiya-Sekor C 127mm f/3.8

NormalMount: Mamiya RB127mmf/3.8 – f/32
Introduced: 1974

Mamiya Sekor C 127mm f/3.8 is the true normal lens for the Mamiya RB67 system — equivalent to roughly a 63mm field of view in 35mm terms, matching the diagonal of the 6×7 cm frame more accurately than the slightly-wide 90mm. Many RB67 photographers consider 127mm the proper "normal" for the format.

Key features

  • Mamiya RB bayonet — fits all RB67 bodies
  • Built-in Seiko leaf shutter — 1s to 1/400, X-sync at all speeds
  • 77mm filter thread
  • 5-element/4-group optical formula with single coating (C series); KL versions have multi-coating
  • Close-focus via body bellows
  • Manual aperture + manual focus

Use case + rendering

The 127mm sees use in studio portraiture, product photography, and landscape work — its slightly-long-of-normal field draws the eye into the frame center. Sharpness is excellent across the field by f/8, and the leaf-shutter design supports flash sync at any speed (a major advantage in studio strobe work).

The Sekor C 127 is the most-common kit lens on used RB67 bodies — buy a body+127 kit and add the 90 and 180 Sekors as your work demands.

Compatible bodies

Related lenses