This X-812 is needed to mount any Canon 5D-series (incl. Mk3) SLR to the X2-PRO system.
The 5D should be mounted with the Canon Battery Grip in place.
The X-812 places the CCD exactly in the optical center of the lens, in horizontal as well as vertical position.
The X-812 will also host Canon 7D and 20/30/40D and 50D all with Battery Grip.
Note that the tripod mount of the Mk1&2 versions had the 1/4″ thread on an asymmetrical place, while the Mk3 is mounted in the center of the block.
The later versions of the X- 812 feature a slot that makes positioning of both possible with the lens in the center of the camera.
Tail sed sausage magna quis commodo swine. Aliquip strip steak esse ex in ham hock fugiat in. Labore velit pork belly eiusmod ut shank doner capicola consectetur landjaeger fugiat excepteur short loin. Pork belly laboris mollit in leberkas qui. Pariatur swine aliqua pork chop venison veniam. Venison sed cow short loin bresaola shoulder cupidatat capicola drumstick dolore magna shankle.