Seamless™ Follow Focus Gear for Nikon 200mm f4 AIS Micro IF LensThis gear fits the Nikon 200mm f 4 AI S Micro IF lens. Please double check the pictures to make sure you lens is the Micro IF version. It will not fit the standard AI S lenses. It is designed specifically to fit this lens and is compatible with any standard 0. 8 Module follow focus. The gear sits 3 6mm high off the focus ring of your lens for a clean, low profile gear that slides smoothly onto your lens and into your current lens case. The gears do