Focus Rings

Lens library · Pentax

Pentax Super-Takumar 135mm f/2.5 58 mm filter focus gear

A 3D-printable module 0.8 focus gear made for the Pentax Super-Takumar 135mm f/2.5 58 mm filter. Start from these measurements, check them on your lens, and download the ring for your own printer.

Saved measurements
Focus-ring contact diameter65.5 mm
Clamp opening (+1 mm allowance)66.5 mm
Focus mechanismFocus mechanism not yet confirmed
Focus-ring verificationNot verified

Not verified by Focus Rings. Lenses vary between versions and copies: measure yours with a tape before printing.

Choose your ring

Slip-on focus ring

A slim module 0.8 gear with this opening and width, dimensions engraved inside. One STL, no account.

Free

Clamp ring

Three built-in clamps with M4 set screws hold it on the lens. STL, print and assembly notes, hardware list.

€9.90

Added hard stops are for mechanically coupled focus rings without usable end stops. They are unnecessary on lenses with built-in stops and unsuitable for focus by wire. This preset is offered for clamp and slip-on rings.

Several lenses? Every further clamp or hard-stop ring in the same order costs €6.90. Keep one outside diameter and your focus motor stays in place when you swap lenses.

Before you print

  • Check the focus-ring diameter on your copy. A tape circumference must be divided by π to obtain its diameter.
  • Print a free test ring first. Material, printer and shrinkage change the fit.
  • Module 0.8 teeth fit standard follow focus units and focus motors from ARRI, DJI, PD Movie and Tilta.
  • New to this? Read how to measure a lens for a focus gear.

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