Darkslide Factors, an Offline Exposure Bench for Film Photographers

Field notes

The calculator follows a photographer's exposure chain rather than reducing everything to a single number: EI and filter density come first, bellows extension follows, and reciprocity correction can be toggled separately. Its stock list includes HP5, Tri-X, Acros II, Portra, Ektar, Cinestill 800T, Velvia, and Provia, with format choices from 35mm through 8×10. The page also describes local storage, saved setups, and shareable text or image cards.