ShuttR vs ShutterMeter

Is your analogue 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 nothing but your iPhone's camera and a light source. No hardware testers, no sensors to buy, no guesswork — reliably from 8s down to 1/500. 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 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. RELIABLE FROM 8s TO 1/500 — ShuttR Check measures dependably from 8 seconds down to 1/500. An iPhone alone cannot resolve 1/1000 and up with an accuracy worth trusting, and we'd rather leave those speeds out than hand you numbers that look precise but aren't. That range also happens to cover where mechanical shutters drift the most and where a deviation actually shows up in your negatives. Timed speeds slower than 1s are there too, for the cameras that offer them. WHAT YOU GET A guided, step-by-step measurement protocol — no photography or technical background needed Automatic calibration (checks your room is dark enough and free of flickering light) Every speed compared against its nominal value, with the deviation in stops and a clear OK / deviation / defective verdict A history per camera, so you can track a shutter's condition over time A camera collection to track shutter's performance including import / export function of your camera list A shareable "shutter checked" certificate (image or PDF) — 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 — these are the shutters in most classic SLRs and rangefinders. Leaf (central) shutters should work just as well, since the app measures the light pulse itself and doesn't care how the shutter produces it, but they haven't been through the same validation, so treat those readings as unconfirmed. 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, and the results are not a laboratory reference — if you need certified figures, a service technician with proper equipment is still the right call. It also does not measure shutter capping. The app times how long light passes through, not how evenly the curtains expose across the frame. A shutter that tapers or caps at one edge can still show correct overall timing here. WHO IT'S FOR Film photographers who want to know if their gear is actually accurate Camera collectors curious about a new find Sellers who want to offer buyers real proof of a working shutter

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.