Large Format Color Exposure
Sheet film, color negative and transparency. Enter your meter reading, working aperture, bellows draw and filters; the page carries the exposure through bellows factor, filter factors and the film's reciprocity correction, with any color-compensating filter the maker recommends.
Film and meter
1/125, 0.5, 4, 1:30
Camera
Filters on the lens
Positive adds exposure. Use for a measured polarizer or deliberate overexposure.
Exposure
How it adds up
Other apertures, same scene
Reciprocity changes with the time, so each pair is corrected on its own.
| Aperture | Metered | Give | CC filter |
|---|
This film: notes and source
Bellows factor is (extension ÷ focal length)², with extension measured from the lens board to the film plane; that is close enough for the near-symmetrical lenses usual on a press or field camera, and wrong for telephoto designs. Reciprocity rows marked published come straight from the maker's data sheet; interpolated rows sit between published points; estimates come from community testing and are flagged. Makers give their corrections as a starting point and recommend test exposures for critical work.