If you want to use your DSLR with electronic flash, be it a portable flashgun or more powerful studiolfash, you need to remember that your camera has a maximum shutter speed at which flash can be synchronised. this variance from model to model and can be anywhere from 1/160 seconds to 1/250 seconds. The latter being the most common. You can use a shutter speed slower than your camera's flash synchronisation speed, but if you use a shutter speed that's faster, part of the image will be blacked out because the flash will fire before the shutter is fully open.
Resource: Digital SLR Photography Issue 47
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