The list author says: "This is a list of lenses that will work on a Canon DSLR camera, but are manufactured by Sigma. The lenses are designed for 35mm film cameras and DSLR cameras with a full-frame image sensor. I've created two others list similar to this list: one listing only Tamron lenses; another with lenses from other makers. Both of those lists are like this one, for full-frame Canon DSLR cameras. See my profile for links to those lists."