The Nikon 600mm f/4 FL is a superb lens, but you need a very long lens plate to balance it correctly with a D810 attached. For example the the Really Righ Stuff LFC-13 replacement foot is not long enough, but there is help on the way. I just received the following email from RSS:
Really Right Stuff Support Case #51499 – “replacement foot for Nikon 600mm FL”
We are in the process of designing a new foot for the 600mm FL and 500mm FL, but at this time I don’t have a timeline for the release of that product(s).
The LCF-17 is another foot we know fits, but reports are similar in that proper balance cannot be achieved, which is leading us to design new feet.
I’d recommend checking back within the next month, when we expect to have more information on those feet. Please let me know if you have any other questions.
From: Simon Speich
Sent: Friday , January 22, 2016 01:06 am PST (GMT-08:00)
Subject: replacement foot for Nikon 600mm FL
Currently I’m using the LFC-13 with the new Nikon 600mm f/4 FL ED VR and
a Nikon D810 without extra battery grip. Unfortunately, the camera is
too light, resp. the lens to front heavy:
Do you have another (replacement) foot that would be longer, but still
let me mount the hood in reverse when stowing away?
Or are you going to produce a new foot designed specifically for the
600mm FL? With the new D500 coming out, which is also a lot lighter than
the D4/D5, more people will have the same problem of the lens being to
front heavy. Do you also produce custom made foots?
Thank you for your help