Red has just added some tools for Cinematographers and Photographers that use Epic or Scarlet cameras to their web site. The new tools are 1. Crop Factor 2. Recording Time 3. Flicker Free Speeds 4. Depth of Field.
You can find the tools at http://www.red.com/tools/crop-factor
At the moment they are online but its rumoured that there may be an app version in the pipeline. I see the record time tool as the best as no other app seems to be able to do what this tool does.
Thanks you Red!