ShuttR vs ShutterMeter

**Is your vintage camera's shutter still accurate — or has it drifted after decades of use?** ShuttR Check measures the real shutter speeds of your analog camera using your iPhone and a light source. No hardware testers, no sensors to buy — from 8s down to 1/2000. Photographers around the world have already tested more than 100 different camera models with it, from SLRs and rangefinders to medium and large format — and now Super 8 movie cameras too. **NEW IN 2.0** - Every speed from 8s to 1/2000, with increased precision: ShuttR Check combines several measuring methods, each tuned to its part of the speed range - Shutter capping check: a light map of the whole frame shows when one edge falls dark at fast speeds - Frame rate check (beta) for motor drives and Super 8 cameras, measured by sound - Video cameras in your collection, each with its own status - Precision confirmed (beta): on focal-plane shutters, ShuttR Check also listens to the shutter — when its sound matches the measured light, the speed is marked as confirmed - Over 130 camera models built in: pick yours and its shutter type is filled in for you - Serial numbers on every camera and on your reports **HOW IT WORKS** Open your camera's film back, remove the lens, and put a light source behind it. ShuttR Check uses your iPhone's high-speed camera together with advanced image analysis to measure exactly how long each shutter release lets light through, then tells you how far that is from the speed you dialled in — in fractions of a stop. The app walks you through every step. There is nothing to configure, nothing to interpret: set up, release the shutter, read the result. **SLOW AND FAST SPEEDS** Check the slow and middle speeds and the fast end separately or together — both show up side by side on your camera's page, each result clearly marked. With a proper light setup, results typically land within about 0.1 EV across the whole range. (Some older iPhone models measure up to 1/500.) **SHUTTER CAPPING** At fast speeds, worn curtains can fall out of step, and one edge of the frame gets less light. The capping check measures the light across the whole film gate, release after release, and shows you exactly where and from which speed on it happens. **FRAME RATE: MOTOR DRIVES AND SUPER 8 (BETA)** Hold your iPhone next to the camera and fire a burst — ShuttR Check counts the frames by ear: frames per second, how evenly they come, and whether the motor slows down. For Super 8 cameras, it checks each running speed (18, 24, 54 fps…) and how steadily the camera holds it. **WHAT YOU GET** - A guided, step-by-step measurement protocol - Automatic calibration (checks your room is dark enough, free of flickering light, and that your light source is set right) - Every speed compared against its nominal value, with the deviation in stops and a clear OK / deviation / defective verdict - A history per camera — every check, every service — so you can see what a repair really did - A shareable "shutter checked" report (image or PDF) with serial number — perfect for camera sellers on eBay, Etsy or classifieds, showing buyers exactly what they're getting **SHUTTER TYPES** Horizontal and vertical focal-plane shutters are tested and validated — the shutters in most classic SLRs and rangefinders. Leaf (central) shutters have been tested on medium and large format cameras. For Super 8 cameras, ShuttR Check measures the frame rate. **WHAT THIS APP IS NOT** ShuttR Check gives you dependable, repeatable information about how far your shutter speeds have drifted. It does not replace a calibrated measuring instrument. **PRIVATE BY DESIGN** No account, no sign-in. Your cameras and measurements stay on your device. Sound is analysed on your iPhone only — never recorded, saved or sent. ShuttR Check shares anonymous usage statistics to improve the app; you can turn them off in Settings at any time.

Has your old camera's shutter slowed down? ShutterMeter uses your iPhone's microphone to analyze the sounds of a mechanical shutter and estimate the interval between opening and closing. Compare it with the selected speed, check repeatability, and keep a test history for each camera. Repeat each speed three times Choose a camera and speed, then follow the measurement flow. Save three Clear signal results before moving to the next speed. Results with complex signals are marked separately and do not count toward the health map. Shutter health map See the median deviation and spread of the latest three clear results at each speed, along with how many speeds you have tested. Find gaps or speeds that need another check, then share a text report through the system share sheet. The report is a shooting and maintenance reference, not a calibration certificate. Archive backup and CSV export Export camera details and measurements as a JSON backup. On another iPhone, choose the file, preview new and duplicate items, then confirm the merge. Items with the same identifiers keep their local versions; existing records are not overwritten. Export CSV files to view raw timings, UTC timestamps and signal grades in a spreadsheet. Exported measurements are diagnostic references, not calibration certificates. For an offline export, choose On My iPhone > this app's folder > Exports in Files. The folder may be named ShutterMeter or 快门测速仪, depending on language. This app folder is part of the app's sandbox and is deleted when you delete the app. Save important backups to iCloud Drive or another location outside this app folder; those independent copies survive deletion of ShutterMeter. Camera log Search by camera name or notes, and edit details without losing measurements. Create a profile for each camera and browse measurements and deviation trends by speed. Save results without a camera to Unfiled and assign them later. Clear signal results include exposure compensation guidance. Your local records remain available to view. Supported speeds This version provides microphone measurement for 11 nominal speeds from 1 second to 1/60 second, including the vintage 1/5, 1/10, 1/25 and 1/50 settings. Camera mode is not enabled. Measurement at 1/100 and faster is not supported. ShutterMeter is an audio analysis aid. Its accuracy across all supported speeds has not been validated against a physical shutter tester. Clear signal describes how well the sound events can be distinguished in that recording; it is not an accuracy certification. Mirror slap, background noise and shutter design can affect the result. Repeat the test before using a result as a shooting reference. Not every mechanical shutter will produce a usable result. Designed for iPhone The colorful interface supports Dark Mode, Dynamic Type and VoiceOver, with clear controls to save, repeat, finish a test run and close sheets. Data and purchase Audio recording and analysis take place on your iPhone. The app does not automatically upload measurement data. When you share a report or export a file, the selected data goes to the app or file service you choose. System device backups may also include local records. Archive backups do not include audio, purchase receipts or free-measurement counts. Use Restore Purchases to recover an existing purchase on another phone. Purchases and restoring purchases require an App Store connection. Your first 10 measurements that produce a result are free. Attempts that do not detect usable shutter sounds do not use a free measurement. A one-time purchase unlocks unlimited measurements, with no subscription or ads.