# Reciprocity Timer

> Film photography reciprocity calculator and exposure timer with advanced features. (iPhone/iPad app by Pump Interactive.)

- Source: https://appshunter.io/ios/app/reciprocity-timer/id459691262 (this page in markdown: same URL + `.md`)
- Developer: [Pump Interactive](https://appshunter.io/developer/459691265)
- Category: Photo & Video
- Price: $1.99 with in-app purchases
- Rating: 3.00/5 from 3 App Store ratings · 87 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 27 MB
- Languages: American English
- Released: 2011-08-31
- Data updated: 2026-08-29
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/reciprocity-timer/id459691262/reviews.md

## What is Reciprocity Timer?

Manage your film photography from start to finish! 
Reciprocity Timer has 2 Version - the "Standard" Version does NOT include advanced features but can be used to calculate reciprocity on a range of common films. The "Pro" Version is available for an additional $9.99 USD (via in-app-purchase) unlocks a range of advanced features.
The initial purchase price allows you to calculate reciprocity for all the films included by selecting an observed exposure time. This $1.99 US non-pro version is suitable for people who just need to calculate an exposure that includes reciprocity adjustments for commonly used films. It will suit many users who don't require or need to upgrade to the pro version for features like note keeping or a camera database etc. It's most suitable if you are new to film. 
More advanced film users and photographers may want to pay to upgrade after their initial purchase to the pro version. If you use a pro-feature you'll be prompted to upgrade for an additional $9.99 US.
This will unlock all the additional features including the Zone Editor, Note, Camera and Film Holder database as well as custom films and filters. 
There is no need to upgrade if you just want to calculate and time reciprocity for a particular film and you always use the same camera.
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.
Once you upgrade then the one app does it all - notes, filters, exposure calculations, custom films, zone system editor, film holder management as well as the reciprocity math!
A comprehensive 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 NDs and Polarizers.
Keep detailed notes and share them. Share your adjusted exposure times with colleagues. 
This app makes film photography a breeze.

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.

Watch companion app now included. To install the app use the Apple Watch App on your phone. Ensure your watch and phone are paired an unlocked and scroll down the list of available apps to Reciprocity Timer. Select Install. You can also turn on "Automatically Install Apps".

## Key features

- Reciprocity compensation calculations
- Exposure timer
- Filter compensation slider
- Note-keeping feature
- Custom film and camera databases
- Film stock favorites

## Pricing and in-app purchases

Base price: $1.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Reciprocity Timer Pro | $9.99 | one-time |


## Chart rankings

- #78 in Top Paid · Photo & Video (US App Store)

## Recent user reviews (10 of 87)

All indexed reviews: https://appshunter.io/ios/app/reciprocity-timer/id459691262/reviews.md

### 1/5 — Bugs everywhere

*2026-08-15, version 3.99*

Unfortunately the bugs didn’t appear until I paid for the app to access the customizable settings. The keyboard stays on screen. The UI elements overlap. It’s a mess.

### 5/5 — The missing app for film obsessives.

*2026-03-27, version 3.99*

I have a technical training in photography in the days of film, which meant a lot of maths, physics and chemistry. The hardest part was long exposures on film at night. Each film having its own issues after 1 second. This app solves that add adds in heaps of the other factors that affect the maths. All done for you! so good. The improvement I would like is the addition of FP4 (not sure why that is missed) and Lucky 100 and 400.

### 4/5 — Timer

*2026-03-15, version 3.99*

Really handy app for shooting larger formats. The timings all seem pretty good and I’ve never had a problem with them. Touch clunky to use but very helpful.

### 5/5 — Only thing like it

*2026-01-09, version 3.99*

Its a little ugly but gets the job done :)

### 5/5 — 非常有用的软件

*2025-10-08*

非常好用，特别对于大画幅摄影，参数比较齐，功能也很多。能考虑的都考虑了。

### 4/5 — A useful app

*2025-09-13, version 3.99*

I’ve been using the app for a few years now and it has been very useful. Two improvements I recommend: 
To be able to lock the film type, as it’s easy to change accidentally, and the ability to select more than one filter without having to return to the main display between each selection.

### 1/5 — Not enough films listed

*2025-08-06, version 3.99*

Not much choice of film stocks listed. I was hoping ultramax 400 would be in here.

### 1/5 — 1/125 档加一档曝光，显示 1/80

*2025-08-02*

这种算是错误吗

### 1/5 — Issue with Reciprocity Timer

*2024-09-17*

I would like to report an issue with Reciprocity Timer App. After the update to version 3.9 the app keeps crashing and closing on my iPhone (14 Pro Max, ISO 17.6.1). I use Reciprocity Timer to record my photo data, and it is very useful. I hope this issue is resolved as soon as possible.

### 1/5 — Issue with V3.9

*2024-09-15*

Hello. I would like to report an issue with Reciprocity Timer App. After the update to version 3.8, the app keeps crashing and closing on my iPhone (14 Pro Max, ISO 17.6.1). I use Reciprocity Timer to record my photo data, and it is very useful. I hope this issue is resolved as soon as possible. Thank you.

## Frequently asked questions about Reciprocity Timer

### What does Reciprocity Timer do?

Reciprocity Timer is a comprehensive tool for film photographers. It calculates the necessary exposure compensation when dealing with reciprocity failure, a common issue in long film exposures. It also includes an exposure timer and features to help manage your film photography workflow.

### What are the key features of Reciprocity Timer?

Key features include reciprocity compensation calculations for various film stocks, an exposure timer for long exposures, and a slider to adjust exposure when using filters like NDs and polarizers. The pro version unlocks advanced features like note-keeping, custom film databases, and a zone system editor.

### How much does Reciprocity Timer cost?

The app has a free 'Standard' version that allows basic reciprocity calculations for common films. An optional 'Pro' version is available for a one-time in-app purchase of $9.99 USD, which unlocks all advanced features. The initial purchase of the standard version costs $1.99 USD.

### What devices is Reciprocity Timer compatible with?

The app is designed for mobile devices and also includes a companion Apple Watch app. Ensure your watch and phone are paired and unlocked to install the watch app. You may need to configure notification settings for the timer to function when your device is asleep.

### Who would benefit from using Reciprocity Timer?

This app is ideal for anyone involved in film photography, from beginners learning about exposure adjustments to experienced photographers who want a streamlined way to manage their workflow. It's particularly useful for those shooting long exposures or using filters that affect exposure.

## Version history (last 5 releases)

### 3.99 — 2024-10-11

Fixes to Note Taker drag and drop and saving. Fixes to PDF Export. Bug fixes.

### 3.95 — 2024-10-02

Bug fixes - maintenance release.

### 3.9 — 2024-09-13

Bug fixes. Expanded and overlapped Bellows Range Sliders to allow for very long Bellows.

### 3.8 — 2023-10-31

More bug fixes.

### 3.7 — 2023-09-27

Bug fixes. Problem with saving camera database fixed (at last!).

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## Related topics

[reciprocity timer](https://appshunter.io/ios/topics/reciprocity-timer) · [reciprocity plus](https://appshunter.io/ios/topics/reciprocity-plus) · [reciprocity](https://appshunter.io/ios/topics/reciprocity) · [silverlog reciprocity](https://appshunter.io/ios/topics/silverlog-reciprocity)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*