Listed below is an HDR script that is camera model independent. It measures what the camera thinks is the correct current exposure and then makes a user specified number of exposures at faster and slower shutter speeds than what the camera specified. Using HDR stacking software on the PC, it will be possible to use some (or all) of these images to create a final high dynamic range image. This script should work on every CHDK equipped camera - contains no camera specific key presses or property case settings. Save with a .lua file name extension ( e.g.fastHDR.lua ).