Help and contact
Support
A question, a problem, or a reading that looks wrong: write to hello@shutterdoc.app and one of us will reply.
Start with the app's own guide
The home screen has How to set up a test, which walks through setting up a camera step by step, and Common questions, which covers how the measurement works and what the results mean.
What you need
- ShutterDoc itself, from the App Store.
- An iPhone that films slow motion. The top of the home screen shows the frame rate your phone will film at. ShutterDoc is built for 240 frames a second; at a lower rate the fast speeds are measured less precisely.
- A film camera with no film in it.
- A bright, even light that does not flicker: a white wall, a window on an overcast day, or a sheet of paper over a lamp. LED and fluorescent lights flicker too fast for you to see but not too fast for the phone.
Testing for capping
Capping, on the home screen, checks a focal plane shutter for a band of the frame that gets less light than the rest. It does not give a speed. Set the camera up as for a speed test, rest it on a tripod or a stack of books, and light it with something broad and even: a screen at full brightness has worked best so far. Fire one shot at 1/15 first, then at least ten at the speed you want to check, as fast as 1/1000. A single fast firing means little on its own, so the report only opens once there are enough.
A run is saved by itself once it has ten firings. Choose Don't save on its report if you do not want to keep it.
If a reading looks wrong
Most surprising readings come from the setup rather than the camera: a light that flickers, part of the shutter outside the picture, or the phone, camera or light moving partway through a test. The app says when it doubts a reading, and usually why.
If you still think something is off, write to us with the camera's make and model, the speeds you tested, and what you expected to see. Attach that test's export, from Export this test, and include the line at the foot of the app's home screen: the version and the short code after it say exactly which build you have.
Your data
ShutterDoc keeps everything on your phone and sends nothing to us. The privacy policy has the details, including how to delete what the app stores.