Reciprocity Plus
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About this app
- Category Photo & Video
- Age 10
- Updated Mar 31, 2025
- OS IOS
Editor reviews
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.
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How to use:
1. Download and open the app, then set your preferred units, film stocks, and commonly used ND filters.
2. Enter your base exposure from your camera or light meter, choose a film stock or digital mode, and add any filters you plan to use.
3. Review the corrected exposure time and adjust aperture, shutter, or ISO until the result fits your creative and technical needs.
4. Start the countdown timer to guide long exposures and follow the alerts to begin or end the shot precisely.
5. Save the shot with notes and location in the logbook to build your exposure reference for future sessions.