The Cavision Focus Gear Ring CARFGR99 can be clamped onto a lens's focus barrel, allowing for the use of a follow focus system. This ring will fit focus barrels with an outside diameter of 98 - 101 mm and is compatible with the cine gear type (0.8 pitch).
Size is determined by measuring the focus barrel's diameter, or by measuring the circumference and dividing by 3.14.
Note:
This gear ring does not include hard stops.