This is *probably a typo*, but the Canon EOS-1Ds Mark IV is included on the "products in this tutorial" listed beside the Chris Bray video tutorial at http://www.canon.com.au/worldofeos/learn/get-creative/low-light-photography-1.aspx?cid=emmycanon110309.
Here is the screen capture:
Probably more informational is the video itself:
(thanks Alex)