I am primarily interested in chdk for my sx40 so i can take raw photos for my use in hdr photography. How would i set up the bracketing feature at -1,-2,0,+1,+2(ev"s) to take 5 exposures.. The settings will be at aperture priority,f8,iso 100 or 200 for night shooting) Also how would i set up the scripting to do the above? I already have chdk installed on an a 2gb sd card. Thanks for your help!!