Based on your 2nd post, looks like you are using a APS-C camera. 17-40mm is a great lens for APS-C. Some poster may say that the 17-55 IS 2.8 is a better lens with about 80% more on the price tag. You will gain 1 stop speed and IS with slight increase in CA. I have used the 17-40mm for more than 7 years on a APS-C body. It is my main lens.
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