Canon to 4x5 stitching back, in excellent condition. Only used one day for some large-format lens resolution testing, indoors.
This is one of the Chinese adapters found on eBay, I see the latest ones have some "gee-whiz' slots milled on the sides of the adatper, which are just for looks.
Works great, enables you to use 4x5 tilt, shift, and swing with your Canon DLR and inexpensive large format lenses. (Or medium format lenses if you research it a little and buy or build an adapter lens board using the mount from a broken MF body.)
$150 Paypal'd & shipped to lower 48 US states from Southern California.