KennyBellew wrote:
I'm stuck with a Nikon D5200 for the moment, and I really need to do some off-camera flash outdoors at low aperture. Of course, this drives my shutter speed up beyond sync.

My challenge is that the D5200 does not support high-sync speed (auto FP).  I thought I might be able to use a high-speed trigger, like the the Yongnuo YN-622N with a compatible high-speed sync flash, but the trigger's user guide says it's not possible with the D5200.

My current flash (the Yongnuo 560 III) doesn't support high-speed sync, but I could buy one that does (YN-500EX), as they are fairly cheap.

Does anyone know of a way to do high-speed sync with the D5200?

The D5200 doesn't support HSS regardless of if you are using a TTL or manual flash.  You are limited to a 1/200 SS. 

You could always get a ND filter to reduce ambient light.  But, depending on when you are shooting, you will most likely need something more powerful than a speedlight. 

Then again, I have read that a SB910 at 200mm has a higher guide number than an AB800 at full power, so you may be able to get away with a speedlight.