Michael, well, what I have already told you about this system has been saidf also here. It is rather flimsy and
cannot hold well a heavy lens and especially not a heavy camera like your D810. I woudl rather consider that
an amateurish toy. I have one sitting around here collecting dust. Personally I would not recommend to risk
your camera or any of your precious lenses on it... but it is up to you of course.
What is really nice is the ROLLEI XACT2 - unfortunately ROLLEI filed for chapter 11 and is no longer. But that
system is extremely well made and will last decades. A friend of mine uses it with excellent results for his
jewelry photography business demanding tilt and shift.