Does the shutter curtain in a digital SLR serve any purpose other than a bit of physical protection for the sensor? I suspect the answer is "no" (correct me if I'm wrong), which got me wondering: if Nikon can x-sync the D40 (and a few other older DSLRs) up to 1/500 because of the hybrid shutter... Why not implement this across their range of DSLRs? Shoot, even the D3 can't sync that high! Sure, if you can afford a D3, you can afford lighting with enough power, but who'd say no to faster recharge times? What's holding Nikon back from syncing hyrbid shutters up to the maximum? If I tape over the TTL contacts on the hotshoe, I can x-sync my D40 all the way up to 1/4000! Of course, I lose TTL flash metering, but this is irrelevant when I'm bouncing the flash, anyway (which is what I'm doing most of the time).