X2-PRO for DSLR : X-823 :
X2-mount for Nikon D3/D3x series
This X-823 is needed to mount
Nikon D3 or D3x
SLR to the X2-PRO system. It is slightly different from the D2x
The X-823 places the CCD exactly in the optical center of the lens, in horizontal as well as vertical position.
X2-mount for Nikon D2x series