Reciprocity Timer3.99 - App Store

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".

Version History This app has been updated by Apple to prepare for watchOS 27 compatibility. No new features are included.

Fixes to Note Taker drag and drop and saving. Fixes to PDF Export. Bug fixes. 3.99 10/11/2024 Bug fixes - maintenance release. 3.95 10/02/2024 Bug fixes. Expanded and overlapped Bellows Range Sliders to allow for very long Bellows. 3.9 09/13/2024 More bug fixes. 3.8 10/31/2023 Bug fixes. Problem with saving camera database fixed (at last!). 3.7 09/27/2023 Updated HP5+ times as per new Ilford spec. 
New feature - can add and edit Shutter Speeds for Lenses. This is useful if you have a lens that has non-standard times. There is a new "edit Shutter Speeds" button in the Lens Editor.
Increased maximum focal length and bellows extension.
Fixed bug in Custom Film Editor and in saving holders.
Other bug fixes. 3.61 03/10/2022 Bug fixes only. 3.55 12/01/2021 Bug fixes. Lots. So many. Ability to back-up and restore the entire database including all cameras, holders and notes. From the "Settings" window you can export and restore the entire database.
Also added some new films - Fomapan 400 and Ektachrome 100. Watch App! Start and check your exposure from your watch.
Re-built Note-Taker for better reliability. Added the ability to swipe through notes.
To install the Reciprocity Timer Watch App please make sure your watch is paired and available. The app is installed from the Apple Watch App on your iPhone. Use these steps:
1. Ensure your watch is paired and unlocked
2. Open the Watch App on your iPhone
3. Scroll down past "Installed Apps" to "Available Apps"
4. Locate Reciprocity Timer in alphabetical list of available apps
5. Press "Install" to add the App to your Watch
6. Once Installed the Watch App will appear on the Home Screen of your watch.
To use the Watch App you need both it and the iPhone app running. 3.51 11/20/2021 Loads of bug fixes and stability fixes.
Added ability to turn Film Holder numbers on and off. 3.12 11/13/2020 It's been a longtime coming! Version 3 of the original, and the best, Reciprocity Timer app for film photographers includes:
- a completely re-vamped user interface
- a completely re-designed Note Taker that's easier to use - you can now drag and drop notes between categories
- support for sharing so you can Export, Save, Airdrop, Text, Email or Post Reciprocity Timer Custom Films, Notes and Camera Data. Export your stuff to iCloud, Dropbox wherever your phone has access to via the "Files" app. Import your data back into RT later.
- re-developed notification system to ensure you get notified when your long exposures are ending
- Redesigned Custom Film editor - can now calculate a reciprocity curve from as few as 5 or 6 data points. If you can get at least *some* information chances are RT can work with it to let you use that film.
- added new films including support for Rollei, Berrger, some IR films, CineStill 50D and others.
- added Film Holder support so you can use the note system to record even more details about your shots. RT will keep track of what holder you are using and the status of each frame. It'll warn you if you select the wrong film or if you try to shoot an unloaded or previously exposed holder.
- Updated Zone Editor. You can now export your Zone-Marked up note images as Jpegs (with Note Exif Data attached) to your photos or the cloud.
- many many bug fixes and improvements 3.11 08/06/2020 It's been a longtime coming! Version 3 of the original, and the best, Reciprocity Timer app for film photographers includes:
- a completely re-vamped user interface
- a completely re-designed Note Taker that's easier to use - you can now drag and drop notes between categories
- support for sharing so you can Export, Save, Airdrop, Text, Email or Post Reciprocity Timer Custom Films, Notes and Camera Data. Export your stuff to iCloud, Dropbox wherever your phone has access to via the "Files" app. Import your data back into RT later.
- re-developed notification system to ensure you get notified when your long exposures are ending
- Redesigned Custom Film editor - can now calculate a reciprocity curve from as few as 5 or 6 data points. If you can get at least *some* information chances are RT can work with it to let you use that film.
- added new films including support for Rollei, Berrger, some IR films, CineStill 50D and others.
- added Film Holder support so you can use the note system to record even more details about your shots. RT will keep track of what holder you are using and the status of each frame. It'll warn you if you select the wrong film or if you try to shoot an unloaded or previously exposed holder.
- Updated Zone Editor. You can now export your Zone-Marked up note images as Jpegs (with Note Exif Data attached) to your photos or the cloud.
- many many bug fixes and improvements 3.1 08/03/2020 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. 2.54 05/25/2018 Bug fixes. 2.04 05/12/2015 Fix for bug in Custom Film Editor 2.03 04/05/2014 Fix for bug in filter system 2.02 02/19/2014 Bug fixes. Fix for Velvia 100/100F times. 2.01 02/15/2014 This version is a complete refresh. It includes many new films as well as iOS7 compatibility.

The new version allows users to upgrade to a pro edition that massively extends the features of the app.

Pro features include:
- Integrated equipment register
- Integrated note keeping to keep track of locations, development requirements and other shooting data.
- A built in Zone System editor
- Ability to print and email notes as PDF and CSV files
- Ability to upload notes to Dropbox
- Ability to add custom films with manually entered reciprocity times or as Gainer Method calculations
- Ability to mark films as favourites so they appear at the top of the film list
- Voice Recorder in the Note Keeper
- Voice activated start of the timer 2.0 02/04/2014 Added Big Stopper ND10 Filter to filters list.
Added plus and minus buttons for fine focal length and bellows extension adjustments.
Minor interface adjustments.
Fixed a bug with notifications. 1.6 12/13/2011 Addresses a problem where the exposure timer would stop when device went to sleep resulting in incorrect timing. 1.5 12/08/2011 Added calculations Fomapan 100 and 200 Film.
Added filter clear button on main view to allow for removing filters without navigating to filter page.
Added small exposure time display (in standard notation) for sub 1 second exposures. 1.4 10/17/2011 Added sub 1 second exposure times for those using stronger ND filters. The app now allows you to select a metered time under a second. Note that the timer will only operate for exposure times greater than 1 second. 1.3 10/01/2011 Fixed a bug in the filter factor calculations.
Fixed issue with editing and scrolling of filter table.
Exposure controls are now disabled during countdown to prevent accidental changes. 1.2 09/20/2011 Added new films including Velvia 100, Kodak TMY, TMX and Efke.
The filter slider now includes a selector to allow you to set filter factors in 1/3, 1/2 or full stops.
Added sliders for calculating and including compensation for bellows extension in exposure.
Added Filter compensation and an editable list of common photographic filters. You can add multiple filters as required.
Fixed volume control on sounds. 1.1 09/14/2011 1.0 08/31/2011