This geared ring is purposed to be installed on FM LENS.
Installation is very simple - just put the gear over original ring and secure three set screws by means of included hex key.
If you don't need the gear anymore, removing is very simple as well - loose three set screw and pull the gear off the lens.
Installation/removing takes about one minute, and doesn't require any special skills.
Inner diameter - 88.3 mm;
Outer diameter -107 mm;
Thickness - 32 mm.
Mod - 0.8 mm (pitch 32).
Weight - 240 g.
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I like it! Review by kennethdp
Love the focus gear! Thanks! (Posted on 2/27/2015)
Great Gear for FM Lens Review by Hans Punk
Nice solid metal construction, requires a firm push to fit onto FM lens, then only needs light turns on the small grub screws to lock solid in place. Due to the high torque of the FM lens helicoid - a heavy duty Follow focus is recommended. When focus pulling by hand, this gear feels nice and chunky. (Posted on 1/22/2015)