If you want to see comparison shots go to the link below you can change focal length and f stop to see comparison. Very useful
http://www.the-digital-picture.com …p=396&FLIComp=1&APIComp=0![]()
Both lenses are solid, the Tamron is a great lens for the money. I went with the Canon only because of the IS and ring USM. I needed the faster focusing and IS as I shoot low light quite a bit.

