About luxmetered

luxmetered is a light meter for film photographers that uses the phone camera to estimate exposure, with an exposure-triangle calculator and reciprocity corrections for long exposures on common film stocks. A phone sensor is not a calibrated meter, and the page explains where it can be trusted and where it cannot. Readings and notes are kept on your device. I built it for a folding camera with no meter of its own.

Who

luxmetered is built and looked after by Saurav Kumar Sharma, an independent developer in India. There is no company behind it and no team; if something breaks, the person who fixes it is the person who wrote it.

How it is built

Everything on this site runs inside your browser. Files you open stay on your device; there is no upload step and no server that could keep a copy. Once loaded, the tool keeps working without a connection. Drafts of the written guides are prepared with software help and then edited by hand; the measurements and examples come from running the tool.

Contact

Questions or a bug report: hello@luxmetered.com. One person reads it; replies take a day or two.

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