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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.