Bayonet Mount Hood with Cold Shoe - Bay I or III

Many TLR cameras don’t include a cold or hot shoe mount, however they almost universally have a bayonet mount on the front lenses, for use with filters and lens hoods.

These 3D printed lens hoods also have a cold shoe attached to the side, for mounting your Reveni Labs Light Meter

Bayonet 1
Also known as: Bay I / B30 / B-30
Outer measurement: 37mm
Inside diameter: 30mm
Sometimes marked: 28.5mm
Fits: Rolleicord and Rolleiflex (with f/3.5 Tessar / Xenar), Yashica EM, Yashicamat, Yashicamat-124, YashicaMat-124G, Minolta Autocord

Bayonet 3
Also known as: Bay III
Outer measurement: 46mm
Inside diameter: 38mm
Sometimes marked 38mm
Fits: Rolleiflex (with f/2.8 Xenotar or Planar)

Please select the variant you prefer, to match your camera

Other Bayonets not currently offered:

Bayonet  2 (Bay II) is the mount for the f/3.5 Planar and Xenotar.

Bayonet 4 (Bay IV) is the mount used for the Wide-angle Rolleiflex with the 55 mm f/4 Distagon.