Silverlog Reciprocity

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.