Seamless™ Follow Focus Gear for Sigma 70mm f2.8 DG Macro Art LensThis gear fits the Sigma 70mm f 2. 8 DG Macro Art lens. Its specially designed to fit this lens and is compatible with any standard 0. 8 Module follow focus unit. Focus gears are generally low profile and sit about 3 6mm high" 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. Custom spec gears can be made on request. The gears do not have to be