Quote Originally Posted by csphua


Hi all,


If my target is not posing for the shot, I know I should set the shutter speed to 1/60 or faster to avoid motion blur. If I shoot indoor using 580EX II, can I set the shutter speed to slower speed (perhaps 1/40) to allow more light to enter my kit lens? Will flash in this case able to avoid motion blur when I use lower shutter speed?
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Neuroanatomist is correct. If ambient is adding to the exposure, you won't be able to freeze motion using the flash. My suggestion is to bump up the ISO and use a shorter shutter speed. Today's cameras have come a long way in the ISO noise department--you might as well make use of the latest and greatest in technology (that is, if you have a relatively recent camera).