I just purchased a canon digital rebel xt and I want a zoom lense. I was looking at a sigma 18-200 or a tamron. Is one better than the other,and is this a good choice.
I have a similar dilemma where I am trying to decide wether to choose a Tamron or Sigma for a 70 - 300 mm focal length zoom lens. Although one thing you should be aware of is both companies are neck-at-neck in competition for the best value lens in its class. I would take a look at the warranties offered by the manufacturer to see which one stands behind their product the most. It seems Tamron offers 6 year warranties on their lenses.
thanks for the info
I have the Sigma 18-20 zoom and love it. I use it on the Digital Rebel XT as well as my son's Digital Rebel (300D). Great all around lens and the price is right. Colors are great and everything else about the lens I like. I think in it's price range it is the best. Just my opinion