Hi, I am looking into a lens with a Nikon mount. The lens is a Carl Zeiss brand lens. Carl Zeiss manufactures its lenses for Nikon, Canon, and Pentax cameras. E-bay sells a ring for lenses with a Nikon mount, to be used on a Canon EOS EF camera body. The rings are the following: Merchant 1: http://cgi.ebay.com/AF-Confirm-Niko...69796?pt=Lens_Accessories&hash=item4aa2de7ca4 Merchant 2: http://cgi.ebay.com/AF-Confirm-Niko...32166?pt=Lens_Accessories&hash=item5ada0b5426 I have two questions in this regard: Do you think the adapter recedes the lens, (so that when shooting the with the Nikon lens mounted on the Canon camera, the adapter "bulks up" the lens. As a consequence of this, the lens is not "in of focus" anymore as if it were on a Nikon body) ?? Have you had a good experience using Nikon lenses on a Canon camera, (or viceversa) ?? Thank you very much in advance, kind regards, igmolinav.