I am wondering if I should just get another copy of the lens or a refund. When I manually move it out of focus all the way to the right (or left), the Canon very quickly & smoothly moves into focus right on. With the Sigma, you can visually see it repeatedly jerking back and forth quickly in the window of the DOF scale on the barrel and that is also what I am hearing. It is a very short back and forth movement but none the less, I've never had a lens do this before.

Suggestions anyone?


Denise

Comparison shots ...


http://www.flickr.com/photos/18085870@N07/sets/72157625414118792/