Shutter speed tester
Old shutters drift slow. Hold the camera close to your microphone, fire the shutter, and this measures the real speed from the two mechanical clicks.
Works best from 1s down to about 1/125. Very fast speeds are hard to hear apart. A quiet room and the camera right against the mic give the cleanest reading. Nothing is recorded or uploaded — it all runs in your browser.
About this tool
An old mechanical shutter drifts over the years, and this tool checks it using your device's microphone. Arm the mic, then fire the shutter near it. The tool listens for the two mechanical clicks that open and close the shutter and reports the real measured speed against the marked speed. Everything runs in the browser and nothing is uploaded.
How to use it
- Grant microphone access and place the camera close to the mic.
- Arm the microphone in the tool.
- Fire the shutter at the speed you want to test.
- Compare the measured speed with the marked speed shown.
FAQ
Which speeds work best?
The two clicks are easiest to separate at slower speeds, so the tool is most reliable from about 1 second down to roughly 1/125. Very fast speeds fire too quickly for a microphone to resolve.
Is my audio uploaded anywhere?
No. The measurement runs entirely in your browser, so the microphone audio stays on your device and nothing is sent to a server.