Light Meter LuMe
Light Meter for iPhone
A precision light meter for film and digital photographers.
LuMe turns your iPhone into a reliable handheld light meter — with spot, center-weighted, and matrix metering, film reciprocity correction, and tools made for medium and large format work.
What it does
LuMe reads light through your iPhone camera and recommends a correct exposure in real time. Pick a metering pattern, dial in any one of aperture, shutter, or ISO, and LuMe solves for the rest.
Designed for photographers who shoot film and want a serious light meter without carrying a separate device — and for digital shooters who want quick, reliable readings for off-camera work.
Features
- MeteringSpot, center-weighted, and matrix patterns. Multi-point spot averaging with on-tap distance via LiDAR.
- ExposureLock any of aperture, shutter, or ISO and LuMe solves the rest. EV compensation dial with 1/3-stop snapping.
- FilmReciprocity correction with Schwarzschild exponents for common film stocks.
- Formats35mm full-frame, APS-C, half-frame, 110, medium format (6×4.5, 6×6, 6×7, 6×12, 6×17), Xpan, large format (4×5, 5×7).
- ProfilesSave camera profiles — format, focal length, fixed aperture — and the viewfinder matches your camera's point of view.
- CalculatorsDepth-of-field calculator (hyperfocal, near/far limits) and guide-number flash calculator.
- ViewfinderHistogram, clipping warning, ND filter compensation, aspect-ratio crop, grid overlay.
- LanguagesEnglish, German, Spanish, French, Italian, Japanese, Korean, Dutch, Polish, Portuguese, Russian, Swedish, Turkish, Arabic, and both Chinese variants.
Who it's for
If you shoot Tri-X on a Hasselblad, Portra on a Mamiya 7, or Velvia on a 4×5 — LuMe is built for you. If you shoot digital and need a fast meter for off-camera flash or video work, it works for that too.