Maylene

these are two different lenses. Compare the Sigma 17-50mm 2.8 vs tamron and youll see that the Sigma 17-50mm 2.8 has higher ratings than the tamron... this is a 17-70mm and there are few lenses of...

1. Serial Number
2. It says int he press release it will be optimized with the camera system- do you think they are going to swap out parts and just ship it back
3. Just- wow...

wrong- the 6 month thing only goes into effect after the initial 4 year warranty expires. Voiding your warranty wouldn't make sense..