Get Nikon D810 at B&H Photo
The Really Right Stuff L bracket for the D800E fits the D810 body plenty well to use, but there is a difference from the D800E that makes the fit less than perfect (side ports in particular).
We just got the D810 body a few days ago, but it is our most urgent project.
Yes, there will be a different plate for the D810. We are working on a design that will hopefully work for both camera bodies, but until we get the prototype, I can't make any promises that it will.
The BD800 L plate will work in a pinch, but gaining access to the port doors will require you to slide the plate away from the body. The bottom of the plate seems to fit well.
The differences between the L-plates for the D800 and D810 all involve the port clearance on the left side of the camera body. We had to shift the dovetails forward slightly and then shift the left side outboard about .165” to provide more access to the port doors with the L-plate mounted tight against the body. The result is similar to the L-plate we make for the Canon 5d Mark III.
A D800 L-plate will mate fine with a D810, albeit with a bit more restricted access to the ports, so if you are in dire need of a plate for the D810, you can simply use the D800 L-plate as a stop gap until we get the final plates finished.
Dan M writes:
Yeah, the old RRS and the Kirk L brackets for the D800 cameras don't really fit the 810 at all. You have to stress the USB 3 rubber door to get it open far enough and the HDMI door won't open at all as it is blocked along its bottom edge the entire length of the door. You have to move the bracket out a quarter inch on the Kirk bracket to get these doors to work. Kirk says they aren't doing one special for the 810. Which means don't get Kirk. The camera body is different. Simple.