iPhone app Reciprocity

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 cameras manual settings,

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