This adapter allows using Arri-B (bayonet) lensesand some Arri Standard mount lenses on cameras with C-mount. Fluted rear design allows this adapter to fit onto the Bolex Rotating 3 lens turret.

A lens is held by three set screws. Intermediate flat spring protects a lens mount from damage by screws.

Lenses with Arri-S (Standard) mount can be used as well, but their operation will change since this adapter locks the lens mount so it can’t rotate inside as purposed by Arri-S original mount. Zoom lenses with Arri-S mount can be used without issues.

The adapter is made of anodized durable aluminium alloy.

May not work with some Arri standard mount lenses that are barrel focus type.