iDC Photo Video SYSTEM ZERO Gearless Wheel Assembly

iDC Photo Video's SYSTEM ZERO Gearless Wheel Assembly is an additional wheel assembly designed for use with the Canon 70-200mm zoom lens in conjunction with an XL1 Follow-Focus kit. This second wheel adds easier, more precise zoom control to the lens by attaching to one of the seven dovetail slots on the XL1's sliding focusing plate--making it the perfect complement to the already existing focus wheel.