A quick up date on my testing using off camera Nikon flash with the X1D. A previously posted I started by using my Elinchrom Skyport HS+ with Elinchrom strobes in my studio. There were no compatibility issues at all. Check the box on occasional studio use. Based on the Skyport success, I was very optimistic that something as simple as the Nikon SU800 IR trigger would work just fine in the X1D hotshoe. That turned out not to be the case. The remote flash would not fire in either TTL or Manual mode when using the SU800 on the X1D. Next up was using a
Nikon SB910 flash in "master" mode to fire the remote flash. Again no luck, the remote flash would not respond. This is still puzzling to me. In my mind, it should work. So on to test 3. I tried a set of Nikon compatible pocket wizards. They worked without any issues. So for now I have a solution using off camera flash. The pocket wizards are even an advantage due to radio vs. IR. However, it is extra gear to carry and I need to order more receivers. But having at least one way to get Nikon flash off the X1D was the most important thing and I have that with the pocket wizards.
My next test is to order the Vello IR trigger for Nikon. I'm not expecting success, the Vello is fundamentally an SU800 clone, but who knows, it just might work.