A focus gear that clamps onto your lens.

The clamp ring adds three flexure clamps with M4 set screws, so the gear holds on lenses where a slip-on ring would turn. Start from a lens in the library or enter your own diameter and width.

What you set

• Lens diameter or tape circumference, or a lens from the library
• Ring width, wall thickness or a fixed outside diameter
• Optional hard stops for focus motor calibration

What you get

• STL generated for your lens, dimensions engraved inside
• Print and assembly notes plus a hardware shopping list (3 M4 thin nuts, 3 M4 × 6 mm set screws)
• One personal fit correction for the same lens within 30 days
• Lens set price: every further ring in the same order costs at least 30% less

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.