Nodal Ninja F6407 Lens Ring Clamp for 7Artisans 7.5mm f/2.8 FE Lens

The Nodal Ninja F6407 Lens Ring Clamp for 7Artisans 7.5mm f/2.8 FE Lens includes a plastic insert ring that mounts to the outside diameter of the lens barrel before attaching the metal lens ring. The lens ring clamp is compatible with R1, R10, R20, RS1, RS2, and M-series heads as well as other Arca-type-compatible clamps. Not only does the ring give a quick release functionality to the lens, but by loosening the collar lock you can rotate the lens at 60 and 90° positions while mounted to any of these heads.