Sigma Art 18-35mm f/1.8 DC HSM follow focus gear

A 3D-printable module 0.8 follow focus gear for the Sigma Art 18-35mm f/1.8 DC HSM: a free slip-on STL or a clamp ring for your follow focus or wireless focus motor. Start with the saved measurements below, check them on your copy and print a test ring first.

Clamp ring for this lens with its saved outside diameter. The ring and the measured surfaces are to scale; the lens around them is a schematic.

Saved measurements
Mount	Not specified
Focus-ring contact diameter	78 mm
Saved clamp opening	79 mm
Ring width	24 mm
Outside diameter (tooth tips)	100.8 mm
Ribbed focus grip	26.3 mm
Focus travel, close focus to infinity	123.2°
Focus mechanism	Mechanical focus without usable end stops
Zoom-ring contact diameter	75 mm

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.

€14.90

Hard-stop ring

Calibration stops for your focus motor at both ends of the focus travel. This lens already has a measured focus travel.

€14.90

Several lenses? Every further clamp or hard-stop ring in the same order costs €9.90. 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 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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