I have a 580EX flash currently. I noticed that whenever I shoot indoors, my shutter spd will fall to about 1/20s @ f/2.8 @ ISO 400. When I use flash, it raises to only about 1/60s @ same f/no same ISO. I tilt my flash head right up as I am using an in-built bounce card on the 580EX. I have to use f/2.8 ISO 1600 to hit 1/200s. I was wondering if I can hit 1/200s w/o ISO 1600 due to the noise problem. Is my flash underpowered? I bought this from a fellow CS-er few months back and he claims it to be new. Thanks man...