Nodal Ninja F6402-1 V2 Lens Ring Clamp for Sigma 15mm F6402-1
SmallRig Clamp-on Lens Adapter Ring (114mm-80mm/85mm/95mm/110mm) 3408
Genustech G-COAR 114 Clamp-On Lens Adapter Ring G-COAR 114 B&H
Clamp-on Ring (75 to 82mm)
Anamorphic Lens Clamps — Vid-Atlantic Media Productions
Fanotec Lens Ring for Meike 6.5mm F2.0 Fisheye (All Mounts) | Fanotec
Sigma 162mm Clamp-On Ring - Duclos Lenses
Amazon.com : NEEWER Mini Follow Focus with A/B Stops, Lens Gear Ring, 15mm Rod & Rod Clamp for Cinema Camera, DSLR/Mirrorless Camera, Compatible with Lens Diameter Up to 114mm, PG001 (Silver) :