ShutterFinder vs RingThing

Stop guessing your shutter speed on set. Point your iPhone at a flickering light, tap Measure, and ShutterFinder tells you the exact shutter speed that makes the flicker disappear in your footage. HOW IT WORKS ShutterFinder films the light at 240 frames per second, finds the flicker frequency with spectral analysis and turns it into a shutter speed for the frame rate you shoot at. It then checks the result at a second frame rate, which unmasks fast LED dimmers that would otherwise look like ordinary mains flicker. Within seconds you know what to set. WHAT IT MEASURES • LED panels and practicals, tube lights, HMIs, neon, monitors and TVs • LED dimmers (PWM) and OLED screens, including many that flicker too fast for the camera to see directly • 50 Hz and 60 Hz mains, anywhere in the world • Mixed lighting: when two lights flicker at different rates, the advice takes both into account and shows the alternative BUILT FOR THE SET • Shutter as time (1/50) or angle (180°), one tap to switch • 23.98, 24, 25, 29.97, 30, 50 and 60 fps, plus any custom frame rate • Change the frame rate after measuring and the advice updates instantly • When no flicker-free shutter exists at your frame rate, such as some tube lights at 60 fps, ShutterFinder says so and gives the setting that leaves the least flicker • Honest results: too dark, too shaky or no flicker at all is reported as exactly that, never as a guess • The circle marks exactly what is measured; tap anywhere to focus • Measuring stops by itself as soon as the reading is solid UNDER THE HOOD • 240 fps high-speed capture with automatic exposure bracketing for dark scenes • Verification at a second, and when needed a third, frame rate to resolve frequencies above what the camera sees directly • FFT analysis with Apple's Accelerate framework and sub-Hz precision • Mains frequencies locked to their exact values, so 100 Hz gives an exact 1/50 PRIVACY Everything is measured on your iPhone. No images or video are ever stored or sent. Anonymous usage statistics (no personal data, no tracking) help us improve the measurements. Requires iPhone XS or later with iOS 17 or later.

RingThing turns focus ring labels into something you actually want to put on your kit. Built for camera assistants working with ARRI Hi-5, ARRI WCU-4 or Tilta Nucleus M2 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 ARRI, cmotion or Tilta LDA 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 ARRI, cmotion and Tilta LDA (.tab, .cml, .tl) 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. • Convert ARRI LDAs to Tilta Nucleus M2 LDA files (Pro) • 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, WCU-4 or Tilta Nucleus M jig and print one on any FDM or resin printer. • The jigs hold the labels squarely against the rings while you press down — no more wonky applications. PRO A one-time, no-subscription Pro purchase unlocks SVG export, .rng import, ARRI-to-Tilta LDA conversion, Data Matrix barcodes, persistent theme and LDA libraries, and saved custom themes. Free version 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.