The Cool-Lux LuxGear Follow Focus Gear Ring (70 – 71mm) is a lens gear that is compatible with focus-barrels with a diameter of 70 – 71mm. It features standard 0.8-mod/32-pitch geared teeth that makes it compatible with cine-style follow focus systems.Known CompatibilityNikon 60mm f/2.8D MicroZeiss Distagon T* 3,5/18 ZEZeiss Distagon T* 2,8/21 ZEZeiss Distagon T* 2/25 ZF.2Zeiss Makro-Planar T* 2/50 ZF & ZF.2Zeiss Milvus 2,8/18 ZF.2Zeiss Planar T* 1,4/50 ZF & ZF.2Zeiss Planar T* 1,4/85 ZF & ZF.2Key Features0.8 cinema pitch geared teeth for compatibility with any standard follow focus.Precision molded, high-durometer silicone construction.Compression fit allows for easy tool-less installation and removal.Continuous 360 of rotation.Secure fit on lenses with barrel diameters between 70 – 71mm.