[QUOTE="Paul"]\nAnyone know if the Canon 50D has programmable auto ISO like the Nikon\nsystem?[/QUOTE]\n\nNo. It has an "auto" value for ISO, but it is programmed by morons, who\ndon't seem to understand anything about how Canon DSLRs work in regards\nto ISO and noise, or about the needs of users.\n[QUOTE]\nFor example, you can program the lowest shutter speed you want to use\nand it will automatically increase the ISO if it needs a slower\nshutter speed than that for correct exposure? For example, if you are\nshooting at ISO 100 in AV and pre set the lowest shutter speed to\n1/30, if it needs 1/15 it will automatically bump it up to ISO 200 and\nuse 1/30 instead?[/QUOTE]\n\nNo. 50D auto-ISO gravitates to ISO 400\n[QUOTE]\nAlso, can you set the maximum ISO it will automatically choose? For\nexample, if you don't want it to automatically go above ISO 800, you\ncan set it to stop at this ISO?[/QUOTE]\n\nNo, but it doesn't go above 400 unless it really, really needs to. Even\nif you have it set to Tv-priority, it will hold the ISO down to 400 when\nit should be at 1600, which makes absolutely no sense, as ISO 400 will\ngive a noisier image than 1600 when 1600 is the right ISO for the maximum\naperture, the set shutter speed, and the lighting.\n\nIn manual exposure mode, "auto-ISO" is fixed at ISO 400! Manual exposure\n(TAv) mode is the one where I would use a properly-working auto-ISO the\nmost.\n\nAn intelligent auto ISO should have *NO* hesitation to raise the ISO as\nnecessary, at least in manual exposure mode ("TAv") and in Tv mode.\nThere is no intelligence, whatsoever, in Canon's system. Whoever is\nmaking the decisions on auto-ISO for Canon is an incompetent moron.\n\nI really don't understand why so many people are interested in limiting\nthe high end of ISO. My problem with Canon "auto-ISO" is that it doesn't\ngo high enough.\n\nDo you like blurred images? Under-exposed images?