D800 flash synch 1/500th on DX

With a wired connection, the D800 will synch at 1/500th with a DX lens as only part of the sensor is used. However, with an optical connection, a maximum of 1/320th is locked in as soon as the flash is popped up. If anyone can work out a way of using higher shutter speeds than 1/320th with the flash up, without an FP compatible flash gun, please post.

With an FX lens you lose about 10% of the frame at 1/400th, 20% at 1/500th, but still have a big file to play with...

I am hoping housing manufacturers will retain the option of wired connections so we can take advantage of these higher synch speeds.

That's great info, thanks, never thought about testing that.

what did you have the flash synch set on 1/320s?

Thanks for the info

You just set your shutter speed. Flash duration is always much shorter than shutter duration. The synch is not really changing, it's just that you are throwing out the peripheral part of the frame that is blacked out anyway. Try it yourself. Take a picture with strobe at 1/250, then incrementally increase your shutter speed and repeat and you will see more and more of the frame blacked out by the focal plane shutter curtain

Great info, Pete! Thanks for testing.