Reciprocity Plus

Reciprocity Plus is a precision exposure assistant for film and long‑exposure photography. It quickly corrects reciprocity failure, calculates exposures with ND filters, and guides your shoot with a reliable countdown timer. Ideal for landscape, night, and long exposure creators, it streamlines planning and shooting so you get consistent results every time. Core features include accurate reciprocity compensation for popular film stocks with custom curves, an ND filter and stacked filter calculator that links aperture, shutter, and ISO, and a one‑tap exposure timer with alerts and shot logging. Built for speed and accuracy, it is the go‑to long exposure calculator for film photography and hybrid workflows, boosting efficiency for both enthusiasts and professionals.