Adair Systems has released a handy little calculator for photographers. I’ve just downloaded it and I can already tell it will be very handy.
In addition to the calculators you might expect (exposure calculator, depth-of-field, and flash exposure), it can also tell you sunrise and sunset for your current location on any date (assuming you have the 3G unit or you have an original unit with enough cell signal to derive an approximate location).
The DOF calculator is going to be very handy. Like many photographers, I tend to grossly overestimate DOF for nearby subjects. Rick Holt, the instructor I work with on the Art Wolfe workshops, is always trying to explain why it’s folly to crank down the aperture on close-ups. Even at 1 meter, using my 100mm lens at f/11, it calculates total depth at 4cm (slightly more than one inch). Get closer, and the total depth shrinks down to nothing.
Well worth the three bucks.
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I don’t see that there’s a way to indicate sensor size, etc. Perhaps it’s in an upper menu? DOF calculations are based upon a bunch of different assumptions, and the sensor crop changes the meaning of some of those assumptions. The photons hitting the sensor at any one point remain the same regardless of the size, of course, but DOF is based on an expected blow-up ratio that the sensor size impacts…
Actually, there is. Click on Options at the bottom right. The third item in that page is Camera, and you can then pick from an obscenely long list of cameras.
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