how is insttall it (http://mighty-hoernsche.de/chdk/dev/a590_stripped_1.bin.bz2) in my camera

• There's nothing to install, no working CHDK yet, only a dump (that's a copy of the cameras original Canon firmware) for developers (for programming / porting).

Hardware limits Edit

Max. aperture appears to be f11 for me. Max ISO appears to be 2000. (Only visual check).