Reciprocity easily calculates exposure settings for great pictures every time. Great for anyone, from beginners to seasoned photographers.
Features:
* Instantly calculate Exposure value, ISO speed, Aperture, or Shutter Speed
* Enter values either directly or via a slider
* Option to choose Exposure value from a list of common scenes
* Convert exposure settings between different cameras or film speeds
* Save the reciprocity failure values of multiple films for future use
* Round exposure stop values to 1/2, 1/3 or both
* Built-in timer for exposure longer than 2 seconds
* Detailed user guide to help beginners make use of their camera's manual settings
Version history
2.0
2017-09-18
This app has been updated by Apple to display the Apple Watch app icon.
* This major update to Reciprocity has the same classic look and functionality, but has been rebuilt under the hood for forward compatibility and future improvements.
* As requested, you may now choose to round values to 1/2, 1/3 or both exposure stops in settings.
* Reciprocity failure can now be saved for multiple films and be selected as needed.
* Reciprocity is now universal and will work on your iPad too!
1.2.1
2013-05-12
Changed filter EV adjustment maximum per filter from 5 to 12 stops
Minor fixes for iPhone 5 screen dimensions
1.2
2011-10-03
* Added countdown timer
* Improved app startup
* Added user guide, can be opened in iBooks
* ISO slider improvements
1.1
2011-04-30
Added code to request user to rate the app
Added In App Purchase to:
* Remove ads
* Add filter adjustment settings
* Add reciprocity failure adjustment settings
1.0
2010-09-23
Download Reciprocity on Android and iPhone for free
Native shutter speeds in full stops are: 1sec,1/2,4,8,15,30,60,125,250,500,1000
tintypes,
Filter function not working
I just bought the Additional Features module for my iPhone 5, and the Filter function is not working. If I try to add a new filter (I need more EVs than the default filters provide), nothing happens -- a new filter is NOT added to the list. Scott, can you fix this?
Onlyme2006,
Good App
This is a one of the best apps I've found for figuring general reciprocity failure for most films. While I have only used it with a couple of films, I have found it to be accurate. This app would be great if it had a timer built in. Right now I have to exit the program, start a clock/timer program for timing the exposure. It would be great to have a timer that would automatically enter the shutter time then when the start button is hit it would count down from between 5 to 10 seconds. Then make a warning sound to start the exposure, then make another warning 5 to 10 seconds before the the end of the exposure. There is room at the bottom for the timer. Thanks!
portajohnnp,
I love cinematography, I hate math
It's always nice to have calculators like this on set. Without it, I'd imagine making a huge fool out of myself doing the math in head or by hand.. Greatly appreciated!
Wayne8,
Great App
Works as you would think. I wish it would measure Ev, though I guess that would make it more of a meter.
It's good stuff!
coolspider88,
great app
works well. Good for easy calculation of shutter speeds in different ISO ranges. That is really perfect for night shots. Like the shutter counter. An dddition of big stopper filter would be great. Thanks