I know 28-75 is the range I want. (or 24-70, etc). I spent a week with my uncle-in-law who is a wedding photographer (manages shooting 8 weddings per week!). I didn't get to shoot with him, but did get to talk with him a bunch about wedding photography, and techniques, etc. So, in the next couple months I am going to try to start doing weddings. I have a 17-85 IS, but really need a 2.8 lens. Canon 24-70 f/2.8 = $1139 Tamron 28-75 f/2.8 = $369 Sigma 24-70 f/2.8 = $429 The Canon will be a "Down the road" type of thing...that is, if I keep up with weddings and can rationalize such a price tag. But, for the time being, I am debating between the Tamron and Sigma. The Tamron has better sharpness reviews, so let's go with that one. Does anyone have experience shooting in low-light with the Tamron? The main question.... would the Tamron 28-75 be a good lens to hold me over until I can afford the Canon?