A free focus gear, sized to your lens.

Measure the focus ring of your lens, type its diameter or one full tape circumference, pick a width and download a slip-on follow focus gear. Opening, outside diameter and width are engraved inside every ring.

What you set

• Lens diameter from 40 to 110 mm, or the circumference measured with tape
• Ring width from 10 to 40 mm
• Automatic wall, a wall thickness from 2 mm, or one outside diameter for all your lenses

What you get

• One STL with standard module 0.8 teeth for follow focus units and focus motors
• Opening, outside diameter and width engraved inside
• Free: no account, no email address

New to measuring? Read how to measure a lens for a focus gear.

More generators

The interactive generators need JavaScript. Every file is generated from your dimensions in millimetres, with module 0.8 teeth and engraved sizes.