Instruct: Classify a review as either positive or negative.
Query: Never Buy Sigma!

I purchased this lens for my Evolt 300 - and it has given me nothing but grief!! When I change from the original lens to this, the autofocus does not work. The same thing happens when I change from this lens back to the original. I regret the money that I paid for this lens. I will NEVER buy another Sigma product!