From the somewhat minimalist description in the Store:
Welcome to myPhoneTools: a pack of utilities for professional photography.
- Depth of field
- Equivalent focal
- EV exposure
Here are screens of myPhotoTools in action:
As you can tell from the screenshots, myPhotoTools picks up on your chosen Windows Phone theme colour and whether it's light or dark, which is a nice touch.
Comments welcome as to how relevant these calculations are for 'every day' DSLR use - surely most use is using 'smarts' in the camera these days? I'm guessing that the real target market is users experimenting with add-on lenses for the first time. 'Shooting' that deer, etc.?
You can buy or grab a trial version of myPhotoTools here in the Windows Phone Store. Yes, it's a commercial app, but quite well done and I imagine that, if you're in the market for something doing these calculations, that a quid or so for the utility is utter peanuts compared to the cost of your add-on pro lenses and bags...(!)