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.
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.