iPhone Screenshots


A simple and effective film reciprocity calculator for photographers. Select a film type and metered exposure time - the calculator will provide a reciprocity compensated exposure time. The app includes an exposure timer so you can time your long exposures. You can also use a slider to adjust exposure when you have filters attached.
The app supports a wide range of film stocks and allows the user to add various common exposure filters such as ND and Polarizers.

The app includes in-app purchase to unlock pro features including a note-keeping feature, the ability to add custom films and the ability to select often used film stock as favorites.

You may need to setup Reciprocity Timer in Settings -> Notification Center to ensure the app's timer can notify you when exposures are ending and your device is asleep.

What’s New

Version 2.54

This is a maintenance release to support iPhone 7 and 8.
Bug and crash fixes. Added iOS 11 Support.
Changed timer so exposures under 2 seconds can now be recorded.
Fixed export to Dropbox.
Changed night-mode to red.

Ratings and Reviews

5.0 out of 5
2 Ratings

2 Ratings

smbooth ,


Not sure why this app doesn’t have more good reviews. Best app ever for anybody using film.

Dwarak Calayampundi ,

Great app for film photography

Before this app came out I used to refer to the manufactures instructions for each kind of film used and they do not have the additional information like filter compensation etc. I find this app extremely useful and have everything calculated for you including long exposures using film. What I also love about this app is the auto note and the feature to take pictures as attachments and the zones editor is a great feature recording what your thoughts were at that time do not have to remember everything thanks for the app made my photography easy.

'bladder ,

Reciprocity failure - another request!

Hi Guys - another request!

I was using the app with PAN-F in the Hasselblad a few days ago, down the coast, to get some nice seascapes, and the exposure time ran to about eight minutes with the 10-stop ND filter. Can you set the app to suspend the iPod auto-lock function to keep the screen and the sound alive while the timer is ticking? That would be a real help.

Other than that, I'm really enjoying the app and putting it to good use to help me get some great photos (when I manage to do my part right!). The reciprocity times for HP5 and PAN-F seem to be pretty close to spot-on.

Thanks again - cheers! Chris.


Pump Interactive
17.6 MB

Requires iOS 8.0 or later. Compatible with iPhone 5S, iPhone 6, iPhone 6 Plus, iPhone 6S, iPhone 6s Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPhone XS, iPhone XS Max, iPhone XR, iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, iPad mini 3 Wi-Fi + Cellular, iPad mini 4, iPad mini 4 Wi-Fi + Cellular, iPad Pro (12.9-inch), iPad Pro (12.9-inch) Wi-Fi + Cellular, iPad Pro (9.7‑inch), iPad Pro (9.7-inch) Wi‑Fi + Cellular, iPad (5th generation), iPad (5th generation) Wi‑Fi + Cellular, iPad Pro (12.9‑inch) (2nd generation), iPad Pro (12.9‑inch) (2nd generation) Wi‑Fi + Cellular, iPad Pro (10.5‑inch), iPad Pro (10.5-inch) Wi‑Fi + Cellular, iPad (6th generation), iPad Wi-Fi + Cellular (6th generation), iPad Pro (11-inch), iPad Pro (11-inch) Wi-Fi + Cellular, iPad Pro (12.9-inch) (3rd generation), iPad Pro (12.9-inch) (3rd generation) Wi-Fi + Cellular, iPad mini (5th generation), iPad mini (5th generation) Wi-Fi + Cellular, iPad Air (3rd generation), iPad Air (3rd generation) Wi-Fi + Cellular, iPad (7th generation), iPad (7th generation) Wi-Fi + Cellular, iPod touch (6th generation) and iPod touch (7th generation).



Age Rating
In-App Purchases
  1. Reciprocity Timer Pro $14.99


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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