I understand that some digital SLRs have electronic shutters, like my D50, which allows essentially unlimited sync with flashes clear up to 1/4000 of a second. I have tried this with a cheap holga flash and it worked just fine. Why, then, does the camera limit dedicated flashes to 1/500 of a second? Also, I've heard that others have actual shutters. Why would you bother with a digital camera? Doesn't this merely limit the sync of flashes to lower shutter speeds and take up more power? It's another thing to break.