i think i read somewhere that if you take raw picture, its better than jpeg picture. is this true? i also read that you can change the exposure after the picture has been taken, how do you do this? and side question, my camera, a XSI. after i snap a picture the screen shows busy for like 2-3 second, how am i suppose to shoot fast if this happens? i tried to take with low quality picture, i tried putting the shutter speed to the max, i have it on continious shoot mode thing. thanks for the help.