Canon fd 50mm 1.4 follow focus ring gear

Canon fd 50mm 1.4 follow focus ring gear

thingiverse

A geared ring to go around the focus ring on a canon fd 50mm 1.4f lens that allows it to interface with a follow focus knob. Should work on any 62mm OD focus ring though. Designed in FreeCAD using its involute gear tool, which is super useful. The specs for the follow focus ring is 0.8 modulus then enough teeth to make the gear large enough for your needs. The FreeCAD file is attached feel free to grab it an modify.

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