Camera light meter
No meter on your old camera? This reads the brightness through your device camera and suggests an exposure. It is approximate — calibrate it once against a scene you know, then trust the relative readings.
Phones auto-adjust their own exposure, so absolute values drift — this is a backup and learning aid, not a substitute for a proper meter. Point at a mid-tone (like a grey card) for the most consistent reading. The camera feed never leaves your device.
About this tool
This tool uses your device camera as a rough light meter. It reads the average brightness of the scene, estimates an exposure value and suggests a shutter speed for your film ISO and aperture. It is approximate, so you calibrate it once against a scene whose exposure you know.
How to use it
- Press Start camera and allow camera access.
- Enter your film ISO and the aperture you plan to use.
- Point at a mid-tone and read the suggested shutter speed.
- To calibrate, enter the true EV of a known scene and press Set calibration.
FAQ
Is it as accurate as a real meter?
No. Phones auto-adjust their own exposure so absolute values drift; treat it as a backup or learning aid and calibrate against a known meter.
Does the camera feed leave my device?
No. The video is processed only in your browser and is never uploaded or recorded.