Reciprocity Timer
Pump Interactive
About this app
- Category Photo & Video
- Age 10
- Updated Oct 11, 2024
- OS IOS
Editor reviews
Reciprocity Timer is a film photography exposure calculator and timer made for long exposures. It corrects reciprocity failure per film stock, compensates ND filters, and times your shots so you can capture sharp night scenes, silky water, and streaking clouds with confidence. Core features include film-specific reciprocity correction with custom curves, ND filter and bellows extension compensation, and a precise countdown timer with vibration alerts and shot logging. Fast, reliable, and offline-ready, it is a practical long exposure, reciprocity, and ND filter calculator for photo and video creators seeking consistent results on location.
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How to use:
1. Install and open the app, then choose your film stock from the library or add a custom reciprocity profile.
2. Enter your metered exposure time along with ISO, aperture, and any ND filter strength or bellows factor.
3. Tap Calculate to get the corrected exposure time and recommended settings for your scene.
4. Start the countdown timer to time the exposure, using screen lock and vibration alerts while the shutter is open.
5. Save the shot to your log with notes, and create presets for frequently used films, filters, and settings.