Silverlog Reciprocity

Compensate for reciprocity failure in seconds. Select your film stock, enter your metered time, and get the corrected exposure instantly.

Silverlog Reciprocity calculates corrected exposure times for long exposures on film, compensating for reciprocity failure — the point where film loses sensitivity during extended exposures.

HOW IT WORKS Select your film stock from a comprehensive database covering Kodak, Ilford, Fujifilm, Fomapan, CineStill, Lomography and more. Enter your metered exposure time and instantly see the compensated time you should actually use.

Every calculation uses manufacturer-published reciprocity data or established empirical formulas, with full source transparency so you know exactly where the numbers come from.

FEATURES • Extensive film stock database with reciprocity data • Instant calculation — no submit buttons, results update live • Source transparency — see the formula or data behind every result • Works offline — no internet connection needed • Clean, focused interface designed for use in the field • Dark mode support

BUILT FOR PHOTOGRAPHERS Whether you're shooting Velvia at sunset, Tri-X under moonlight, or Delta 3200 in a cathedral, Silverlog Reciprocity gives you the corrected time without fumbling with charts or guesswork.

Part of the Silverlog photography toolkit. No account required. No data collected.