currently I am using one Metz 52 AF-1 off-camera (D7100) and 2 YN622N transceivers. I just found out, that the FVL feature isn't working with that setup. When I press the FVL button, the flash emits a "test-beam" and the camera locks the value - fine. Once I take the first shot, it emits a "metered" beam of light, which is fine too - BUT only a single time! Every further shot I take won't trigger the flash! I have to press the FVL button again, to remove the value, to make the flash fires again.
The Metz itself, directly on the camera, is working perfectly.
My Question to you guys: Is there anyone who has D7100 + YN622N + SB-700? If so, can you do me a favor and test this for me? I just want to know if it works with Nikon flashes.