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Reciprocity Compensation

Dropdown films • Ilford (Tc = Tmp) + Kodak (tables) • accent #ff1c5a

Film & metered time

You can type formats like 1.3, 1:30, 90s or 1m 30s. Minutes mode treats a bare number as minutes.

Result

= — s · —:—
Compensation: stops

Stops = log₂(Tc/Tm). Kodak color-neg tables come from E-31 stop offsets converted to seconds at the specified metered times.