Filmeter — Film Light Meter

Turn your camera into a film light meter: EV, shutter/aperture pairs, the Zone System, reciprocity and incident metering. On-device, no account.

Filmeter turns your iPhone into a light meter made for film photography. Point the camera at your scene and get the exposure value (EV) and a full ladder of shutter and aperture pairs at your chosen ISO — the analog metering workflow, in your pocket.

— THREE WAYS TO METER — • Reflected — read the light bouncing off your subject (free). • Incident (beta) — point toward the light for a falling-light reading. • Sunny-16 — no camera needed; pick the light by condition and go (free).

— THE ANALOG TOOLKIT — • The Zone System — spot-meter tones onto zones 0–X and read your scene's contrast. • Reciprocity — correct long exposures per film with the Schwarzschild law. • Filter & bellows — add the stops for ND/polarizer filters and macro extension. • Film profiles — save your stocks (ISO + reciprocity) and meter with them. • Calibration — tune the meter once to your own device for accuracy you can trust.

— LOG YOUR ROLLS — Log every frame — EV, aperture, shutter, mode — into named rolls, and export any roll to CSV for your notes.

— PRIVATE BY DESIGN — Filmeter reads only the camera's live exposure — it never captures or stores a photo. No account, no cloud, no analytics, no third-party SDKs. Everything stays on your device. The app's only network use is Apple's App Store for your purchase.

— FREE, WITH PRO WHEN YOU WANT IT — Reflected and Sunny-16 metering, EV and exposure pairs, calibration, one film profile, and the roll logbook are free. Filmeter Pro adds incident metering, the Zone System, reciprocity, filter & bellows, CSV export, and unlimited film profiles — via a Monthly or Yearly subscription (3-day free trial) or a one-time Lifetime purchase.

Filmeter Pro is an auto-renewing subscription. Payment is charged to your Apple ID at purchase confirmation. It renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period; your account is charged within 24 hours before renewal. Manage or cancel any time in your App Store account settings. Lifetime is a one-time purchase, not a subscription.

— NOTE — Filmeter is an estimate, not a laboratory instrument. Readings depend on your device's camera and calibration — always cross-check important exposures against a trusted meter.

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