TimerGlass

After the reciprocity math, it stays with you until that frame is done. TimerGlass 2.0.

TimerGlass is the field companion for film photographers — reciprocity, pinhole geometry, exposure estimation, and a beautiful timer, all in one quietly designed app.

WHAT IT DOES • Reciprocity failure correction for 100+ film stocks (Ilford, Kodak, Fuji, Foma, Rollei, ADOX, CineStill, Lomography and more) — built from manufacturer data sheets. • ND filter stack and bellows extension compensation are folded into the same calculation. • Pinhole camera tool — Lord Rayleigh's optimal aperture, effective f-number, equivalent angle of view by film format, and Sunny-16 exposure estimation that flows straight into the timer. • Long-exposure timer with Live Activity and Dynamic Island, accurate even when your phone is locked. • Long-exposure side-effects advice — pull-development guidance for B&W, color-shift tips for negative and slide film, contextual to your actual exposure time. • History of recent exposures with all the parameters you used. • Custom film stocks — define your own with power-law or lookup-table reciprocity curves.

DESIGNED FOR Large-format and pinhole photographers who do long exposures often, 35mm and medium-format shooters chasing dusk and night scenes, and anyone tired of squinting at a film data sheet by torchlight.

LANGUAGES English, 简体中文, 繁體中文, 日本語, Deutsch, Français.

PRIVACY TimerGlass collects nothing. Everything you do stays on your device.