Revision as of 14:32, 7 December 2015 by Dustin McAmera (talk | contribs) (Added a tiny bit about filters etc, just to establish that these bayonets also need to be covered, either here or on their own page.)
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This is a work in progress.

A bayonet coupling is a way of attaching a lens, or a lens accessory such as a filter or hood, typically by a push-and-twist action. It has the advantage of being faster to mount or demount than a screw-thread, and it automatically puts the lens or accessory in a certain alignment once mounted.

Bayonet lens-mounts

One of the problems many users and collectors may encounter, is to positively identify a bayonet mount of an isolated lens they are looking at. This comes into play especially with the third party lenses.

Manufacturer and Mount Type Descriptive text Annotated Photo Unmodified photo


Koni-Omega mount designed by Konica and then continued by Mamiya when they took over production of the Rapid Omega models.
Three-lobed bayonet with shutter release set internally at the 9 o'clock position (S). Small lens board with rangefinder coupling pin (R).
Bayonet diameter: XYZ mm

Bayonet hood and filter mounts

  • Franke & Heidecke adopted three bayonet mounts for the various lenses offered with the Rolleiflex cameras. These serve hoods, filters and close-up lens pairs. Some other makers of TLR cameras have adopted the Rollei bayonets, particularly the Bay I fitting.
  • Some Hasselblad lenses use bayonet filter mounts.