[Foto] FYI: fCalc

[Topybear]

http://www.tangentsoft.net/fcalc/

<features>

Major Features

f/Calc currently understands these formulas:
f Number Arithmetic - Find out things like what f/2.8 plus 2.5 stops 
equals, and how far apart two aperture values are, in stops.
Depth of Field - Calculate the depth of a lens' field of acceptable 
sharpness at a given aperture and focus distance.
Hyperfocal Distance - Find the optimum focus distance to get maximum depth 
of field for a given focal length lens at a given aperture.
Field of View - Find out how wide an area a lens can capture.
Angle of View - Find out what angle a lens of a given focal length covers, 
for a certain film format.
Magnification - Given the distance to the subject and the focal length of 
the lens, find out how large it will be on film.
Spot Meter - Find out how many degrees your camera's spot meter covers, 
with different lenses mounted.

Other Features

f/Calc is film format-agnostic. It currently knows about all common film 
formats from APS on up to 11x14, including some uncommon ones, like 6cm x 9cm.
f/Calc recalculates the equation's results each time you change a field in 
the program, so that you can plug values into the calculator, and 
immediately see their effect on the results.
When you change a value in one section of the calculator, such as the film 
format, all other parts of the calculator use the new information. This 
allows you to jump to another calculation and continue working with inputs 
or calculated values from other sections.
The program has extensive online help, including a discussion of terms, how 
the program does its calculations (including the formulas used), and how 
you might use each section of the calculator.
It's available for several platforms: Palm OS, Windows and Mac OS. There is 
also a Tcl/Tk version; Tcl is very portable, with ports to virtually all 
Unixes, Linux and Windows. (Tcl/Tk has also been ported to the Mac, but the 
required Tix add-on library hasn't been.)
</features>

Free, kivéve a Palm verziót, az ugyanis shareware.

Topy