ShuttR: Shutter Speed Tester
Analog Film Camera Accuracy
About
This app uses your iPhone's camera to accurately measure the shutter speeds of analog film cameras. It provides a guided process to check if your camera's shutter has drifted over time, offering a clear verdict on its performance without requiring external hardware.
What's New in ShuttR
1.2.2
September 26, 2026
- How-To has a link to my free 3d printable iPhone Stand to further improve physical measurement setup - Quick Check can now add results to Camera Collection or add a new Camera
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Developer apps
FAQ
How does ShuttR test my analog camera's shutter speed?
ShuttR uses your iPhone's high-speed camera to record the duration of light exposure through your analog camera's lensless body and a light source. It then compares this measured time to the dialled-in speed, reporting the deviation in fractions of a stop.
What shutter speed range can ShuttR accurately test?
ShuttR reliably tests shutter speeds from 8 seconds down to 1/500th of a second. It omits speeds above 1/500th as an iPhone camera cannot resolve them with sufficient accuracy for this purpose.
Does ShuttR require any special hardware to work?
No, ShuttR requires only your iPhone's camera and a light source. It is designed to avoid the need for external hardware testers or sensors.
What types of shutters can ShuttR test?
ShuttR tests and validates horizontal and vertical focal-plane shutters found in most SLRs and rangefinders. While leaf (central) shutters should also work, their readings are treated as unconfirmed as they haven't undergone the same validation process.
Can ShuttR measure shutter capping?
No, ShuttR does not measure shutter capping. The app focuses on timing how long light passes through the shutter, not on the evenness of exposure across the frame.
What information does ShuttR provide after a test?
After each test, ShuttR provides a comparison of every speed against its nominal value, detailing the deviation in stops and offering a clear verdict (OK, deviation, or defective). It also allows you to track a shutter's condition over time.
Is ShuttR suitable for selling cameras?
Yes, ShuttR can generate a shareable 'shutter checked' certificate (image or PDF). This is ideal for sellers on platforms like eBay or Etsy, providing buyers with concrete proof of the camera's shutter performance.
How often is ShuttR updated?
The app was last updated on September 26, 2026, indicating a commitment to ongoing development and support for its users.
