Re: 20D GETS EXTREME !!! Most cameras can't sync at speeds higher than 1/250 sec. Canon gear, on the other hand, has a "high-speed sync" mode which will sync the flash at any shutter speed up to the 20D's max (1/8000), albeit at a lower power. So the flash is very quick, but not very bright (kinda like a hummingbird in that respect). That's why you need the high ISO setting. Otherwise, the flash output isn't enough to illuminate the scene. The drawback of using high shutter speeds like 1/8000 with a flash is that the pic will look like it was shot at night. It's not a natural look, but it's fun to play around with. Annika1980
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