Balto
Active member
It's sharper, has better contrast, is built better, weather sealed, produces better colors straight OOC, and has a filter size you can actually work into a system. It's not even a question of it being a better lens, because it is in every aspect other then speed. Unless 2.8 is absolutely crucial(not for filming skiing durnig the day), then the tam falls short in pretty much every area. And you can get a used 17-40 for under 500(I did). Not to mention with modern mid to high iso tech looking as good as it does you shouldn't have an issue bumping it up to make up the single stop difference in light. The only thing thing the tam has going for it is the price, which is a completely valid reason to pick it up, but for just a little more the 17-40 IS a better lens for what the majority of people looking for a lens in that length are after. When it is largely going to be used stopped down to 5.6-11, the canon beats the tam hands down. I have compared the 2 side by side on multiple occasions and completely stand by that.