I have an as-new EOS to 4x5 sliding adapter I'm not using if anyone is interested, it's this one:
http://cgi.ebay.com/Moveable-Adapter...item4837c76589
If memory serves it has about 40mm of movement, so you can get two full frames for stitching. The only reason I'm not using it is that after I tried it I built my own rig that has a lot more movement, both vertically and horizontally. (I have a mill and do some machine work.) Of course more movement means you get into sensor shadowing, but it's still a neat little gizmo.
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