« Previous page X2-PRO for DSLR : X-823 : 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 SLR. The X-823 places the CCD exactly in the optical center of the lens, in horizontal as well as vertical position.   Related products:   X-821 X2-mount for Nikon D2x series » Details