RingThing — Focus Ring Maker

RingThing turns focus ring labels into something you actually want to put on your kit. Built for camera assistants working with ARRI Hi-5 and WCU-4 hand units (with others in development), it lets you design, preview and export beautifully laid out focus, iris and zoom ring labels straight from your iPhone.

Open a .rng file exported from a Hi-5, or import LDA (.tab) calibration tables for the lenses you're using — and RingThing renders a ring label that matches the engraved scales, mark for mark.

DESIGN • Carefully drawn typography for imperial and metric focus scales, including superscript fractions and decimals. • Interpolated minor marks with adjustable density so dense ends of the scale stay readable. • Theme system with presets you can override; build and save your own themes, or import a friend's with a QR code. • Live preview with rotation, contrast cues and a print-accurate layout.

SOURCES • Open .rng files exported from an ARRI Hi-5. • Import LDA (.tab) lens calibration tables — by file, by scanning a QR code, or from a photo. • Choose which scale to render from a multi-axis LDA: focus, iris or zoom. • Files restore on cold launch, so the lens you were just working on is right there when you re-open the app.

EXPORT & SHARE • Print-ready PDFs and PNGs sized for A4 stock. • Crisp SVGs for design and cutting tools (Pro). • Themed story-image exports for sharing your work. • Optional contrasting border on print exports for cleaner trimming. • Share imported LDAs with the rest of your camera department.

3D-PRINTABLE APPLICATION JIGS • Share an STL for a left- or right-handed Hi-5 jig and print one on any FDM or resin printer. • The jig holds the label squarely against the ring while you press it down — no more wonky applications.

PRO A one-time, no-subscription Pro purchase unlocks SVG export, .rng import, persistent theme and LDA libraries, and saved custom themes. Free users can take LDA imports for a test drive each session before deciding.

Feedback and feature requests are very welcome via the Instagram link inside the app.