I'm a new T1i shooter who has had a DSLR for a few months but have only been able to use it sparsely (damn job and other hobbies). My current lens lineup has a huge hole in the middle.
10-22mm, 50mm 1.8 and 1.4 (the 1.4 is from my wedding photog buddy .... the 1.4 was collecting dust in his setup apparently), 55-250mm IS.
Yes, huge hole in the 22-50 range. While I don't know what I like to shoot most yet, I do know I enjoy, I love the wide angle shots I see often. That's why I ended with the 10-22mm, plus I got a great deal on it, so I would most definitely profit if I resold it. The 55-250 I bought because it was cheap, and if I don't need telephoto that often so if I do, I have a cheap lens for it. The 50mm 1.8 is obvious.
I find the 50mm to be too long on a crop sometimes, and not long enough at other times. SO I'm thinking, I need maybe a prime 28/30/35. I shoot a lot at gatherings, weddings etc. (recreationally) so a low light fast prime is ideal? But then I would love to have a walk around zoom with great contrast and color. The 17-40mm F4/L looks very interesting.
So, two scenarios. Keep my current setup and save for a ~30mm prime, like the Sigma, or the Canon 35/2. Or, sell my 10-22mm (but I may miss that last 7mm, you always miss it when you lose it) and get the 17-40L, which will allow me a better walk around lens, but will lose the low light capability. But I guess I can still save up for a 30mm prime as well in the second scenario.
For those that have used both, if any, how does color contrast on the 10-22mm compare to the 17-40? I hear the word "L Quality" tossed around with the 10-22mm, but you know how that goes sometimes.
So those are my two options right now, to fill that "gap"

The tamron I looked at because I wanted to do some food photography and it has a mini macro capability. How are the colors, contrast sharpness etc? AF doesn't have to be fast at all for food photog
