I don't know how much help I'll be to you. I don't have the Canon wide angle but I do have the Tamron 17 to 50. It's just an f/2.8 but takes wonderful pictures. It is really versital when I'm doing outside portraits as well as in the studio. I alo have a Tamron 28 to 300 which I love and I've used it so much that I need to have the contacts worked over a little. It's 1:3.5-6.3 Macro. Its so wonderful on vacations as its about the only lens one needs to carry. I have other Canon lens and like them. However the 28-300 is probably my favorite even though it's not Canon. I shot with a Canon 7D and a Rebel XT