Exposure Calculator
Sunny 16, equivalent exposures and long-exposure correction.
Sunny 16
No light meter? Pick the light and your film's ISO.
LightExposure–Equivalent exposure
Change the aperture (or add an ND filter) and keep the same exposure.
Use–Reciprocity
Film loses sensitivity in long exposures: give it more time than the meter says.
sExpose for–
Good to know
- Sunny 16 is a starting point: it works best with negative film, which forgives over-exposure. When in doubt, give one stop more.
- Reciprocity uses Ilford/Harman's formula (corrected time = metered time ^ p). For other films, look up the exponent or table in their data sheet.
- Times accept 1/2, 8, 30 or 1:30 (minutes:seconds).