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The Cavision Focus Gear Ring CARFGR90 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 89 - 93 mm and is compatible with the Fujinon gear type (0.6 pitch).
Size is determined by measuring the focus barrel's diameter, or by measuring the circumference and dividing by 3.14.