FilmRecip: Reciprocity Failure

Meter a long exposure, pick your film, and see the reciprocity-corrected time and how much to add — 40 stocks, sourced from manufacturer datasheets.

See the real exposure time before you open the shutter. Meter a long exposure and pick your film — FilmRecip shows the reciprocity-corrected time and how much to add, using each manufacturer's own published correction model.

FILM STOCKS • 40 black & white, color negative, and slide films from Ilford, Kentmere, Kodak, Fujifilm, Foma, CineStill, Rollei, Adox, and Bergger • 33 use official manufacturer datasheets, transcribed value by value • The rest are clearly labeled: manufacturer general guidance, or a community t^1.3 estimate where nothing is published

THE CALCULATION • Enter the metered time in seconds, m:ss, or h:mm:ss • See both numbers a chart can give you — the total corrected exposure AND the time to add — so you never apply the wrong one • Stops of correction shown alongside, for filter and aperture adjustments • Every result is labeled with its confidence — official datasheet, manufacturer guide, extrapolated, or community estimate — with a link to the source document

RESULT CARD • A clean, shareable card with the metered time, corrected time, added time, and stops

HISTORY • Every calculation you commit is logged automatically and free to browse

FILMRECIP PRO Calculating and logging are free, forever. A one-time Pro Lifetime purchase unlocks the shareable result card, favorites, and CSV export of your history. No subscription, no renewal.

PRIVATE BY DESIGN No account. Your calculations stay on your device. FilmRecip is a calculation aid built from published manufacturer data — actual film response varies with temperature, developer, and batch. Bracket exposures that matter.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/