Hello all! I have Googled a bit without succes for this: I understand the difference between front and rear curtain sync flash and found how to do it with my camera built-in flash. But is it possible to fire the flash anywhere between the front and rear curtain during an exposure? So, say: with a shutter speed of 2 seconds, I want my flash to burst after 1 second in the middle of the exposure... I will probably not be possible with the built-in flash (as I have read the manual without finding anything about it), but perhaps with an external flash like SB-600 or SB-800? Thanks! G.