The SYSTEM ZERO Standard Gearless Follow Focus for Canon 5D MkII is an affordable and versatile follow-focus system designed to lend cinema-like focus control to your DSLR videos. The system's gearless design means that, unlike most other DSLR follow-focus units, this one doesn't require the purchase of dedicated gears to match each lens you use. An adjustable focus wheel attaches to one of four dovetail slots on the sliding focusing plate, which in turn mounts to the dedicated base plate beneath the camera.
The base plate, designed expressly for the Canon 5D MkII, can use any standard quick-release assembly for mounting onto a rig or tripod. It also accommodates iDC's adapted Hoodman loupe or a Zacuto Z-Finder, if you need to use a larger viewfinder for even more precise focus. When not in use, the focusing wheel can be slid away from the lens and locked in place, or the combined baseplate/focusing plate/wheel can be removed as one piece (using an allen wrench) for easy switching between video and stills shooting.