Douglas Photo Calculator is one of the most feature rich applications for calculations I’ve ever seen. Of course, since I’m no professional photographer I haven’t seen all there is, but this app won’t be leaving my iPhone as long as I have a good camera in my bag and a good view in front of me.
With it you can calculate all those neat little things you were taught when learning photography… Quickly and without any pain. Enter the details of your objective (f number, length) and camera (“film format”, or if you prefer, sensor size) and with it you’ll get quickly and without further pain the angle of view and focus. You can also switch to hyper-focal distance to get the details you’ll get in this case (again, like angle of view, image width and image height.) If you have ever dulled through a “classic” photography course you’ll know how hard these details are to get unless you are very used to them (and even then, good professionals recalculate all these things.)
Entering the details is easy, all fields offering a large set of default/industry used values as well as offering a manual option (which is great, since this makes the app almost “future-proof”.) You can choose among 5 languages (English, French, Italian, German and Spanish) as well as between metric (metres) and imperial (feet) units for the distances. You can even set your own circle of confusion value, which is something severely lacking among other similar applications. Not that I have ever changed this myself in the hand-done calculations I’ve done in the past, but it’s good to know I can tweak anything with Douglas Photo Calculator.
Feature-wise Douglas Photo Calculator is excellent, easily brushing up the competition. Works fine in iPad and iPhone (of course also in iPod Touch, and there is a separate Android app for all the Android phone users) and includes an extensive manual full of definitions to make sure you are not missing anything from the menus or settings. If I had to nitpick, the manual would improve with some cleaner formatting, and the application looks much better in iPhone than in iPad, but this is to be expected from such an app. I don’t think many photographers want to hold a relatively heavy SLR in one hand and an iPad in the other while entering numbers. Far better to carry a smaller form-factor like an iPhone or iPod Touch.
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