As far as my experience goes, "I'd rather buy Canon"-attitude is not based on rational thinking. Again, according to my experience (can't say for sure as it would require quite heavy testing setups) and what I've read, some lenses in the Tamron SP range are chaper and have "better" or "equal" (this is partially subjective) image quality compared to the equivalent Canon L lens (specifically I have experience of Tamron 28-75/2.8 and Tamron 17-35/2.8-4.0). If you need for instance weather sealing (and have a weather sealed body), then Canon is your only choice. But as a friendly advice, when choosing which lens to buy, brand in it self is irrelevant. Consider the other factors of course, but don't look at the brand.Alex06 said:Also planning on getting the Canon 100mm 2.8 macro. Canons got a rebate going on now. I had been thinking about the Tamron 90mm 2.8 but I'd rather buy canon.