f/Calc

f/Calc application is a calculator for photographic formulas.
These formulas are at the heart of many interesting questions about the technical side of photography. You could compute these functions by hand, but they range from tedious to difficult, even with a good scientific calculator.
When you let f/Calc do the hard work, you gain an intuitive feel for what the results mean, because you can quickly try new input values to see how they affect the result.
The equations ƒ/Calc uses aren’t secret or difficult. You handled more difficult equations in high school math class, and this manual gives you all the equations.
You may therefore be asking, why use Æ’/Calc if you can do without? Simply, because crunching the numbers by hand is tedious and slow compared to using Æ’/Calc. The faster you can work through a problem, the quicker you can get back to shooting. Or, you can learn several things in the same amount of time as it would have taken you to crunch the numbers for a single problem by hand.
Æ’/Calc also takes into account unit conversions and provides advice on calculated results based on its knowledge of lenses, helping you to avoid mistakes.
Note: While it’s still in beta, the Local version of ƒ/Calc is also free to use. It will be inexpensive shareware when it’s released, probably around $10.System requirementsAdobe AIR runtime.