If you still shoot film, and occasionally need to calculate settings for your manual flash, all you have to do is reach for your iPhone. Reviewed in Macworld, PhotoCalc is an iPhone app that goes deep into f-stops and focal length the old fashioned way, including help with the Zone System. Yes, your iPhone can help you shoot like Ansel Adams.

“Photocalc is essentially a photographer’s toolbox, providing a group of widgets to do all the primary calculations for you as well as giving you additional information that could be crucial to getting just the right shot. After launching the app, choose your camera from PhotoCalc’s extensive list of options; these include not only every digital camera on the market (and many older models), but all film formats, including several cinema films.”