Sigma 17-70 - Tamron 17-50

i have the 17-70 right now and was thinking about selling it and maybe picking up the tamron 17-50. I like how it is 2.8, but how is it compared to my 17-70? I know ill lose the extra range but dont use that distance that much anyways. What are your opinions?

The Tamron is a great lens.. You will find its better in low light than the Sigma..

I sold my Sigma for the Tammy with no regrets.

I used to have the Tammy and absolutely loved it. It was my only lens for a trip to Rome in February and it captured some awesome shots at low light in the Basilica's etc. You will not regret buying it!!

I have the Tamron 17-50 and my biggest problem with it is the focal range. This lens is my walkaround lens, and it is on my camera almost exclusively. When I get frustrated it's not because the lens doesn't get as wide as I want, but rather because the lens doesn't get as long as I want.

I'm a big fan of the 17-50, but I really think that you need to consider what you will lose.