Expozia — Film Light Meter

Expozia is the light meter I built for my own film photography — a precise, no-nonsense instrument for getting exposure right on film.

It reads actual light through your phone's camera and gives you the settings you need, instantly.

What's inside:

Live or Static metering — read continuously as you move, or tap Measure to freeze a reading on screen. Reset it, or save it straight to your camera roll.

Three metering modes — matrix, center-weighted, and spot. Zone size is adjustable for center-weighted and spot; matrix analyzes the whole frame. A live luminance histogram shows the scene's tonal distribution.

A film logbook — frames organized by roll. Save each one with full settings (ISO, aperture, shutter, luminance histogram) — or as a clean frame. Film has no EXIF; here it does. So you learn how each stock behaves.

Expozia is free to use, with a full metering toolkit and a real film logbook built in.

Expozia Pro unlocks:

Unlimited rolls and frames — no cap on how many rolls you keep or how many frames each one holds.

A manual flash calculator — guide number with LiDAR distance, or set the distance by hand.

ND compensation — meter through any ND filter, the math is handled for you.

Custom gear ranges — set the exact ISO, aperture, and shutter ranges your camera has, and pick your lens focal length.

Expozia Pro is a one-time purchase — no subscription, no ads. Buy it once, keep every feature forever, including anything added later.

Made by a film photographer, for film photographers.