I have the following issue when I'm using a pc sync cord to trigger a flash. In the first shot taken after the camera has been turned on, only about half of the frame is lit and the rest is black. In subsequent exposures, the whole frame is exposed. The problem occurs with both my D3 and D700, and it's not dependent on the flash unit used as far as I've been able to determine. Since both my cameras behave in the same way I'm wondering if I am doing something wrong. If you have used the pc sync cord to trigger flashes at 1/250s using one of these cameras, do you have a similar experience? Thanks.