Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Surprising quality from a die hard Canon lens user

I was recommended these lens by another photographer. I had a hard time believing Tamron could actually put out something that offered superb quality in photos. I have been a die hard Canon user and only using canon lens with my 30D however when my Canon 28mm broke, I was desperate, albiet strapped for money to find lens and I wanted a zoom lens. What attracted me very much was the FIXED 2.8 range throughout the 17-50. To me, that was a winner! I already used it twice for two photo shoots and the quality is just amazing. The lens are so sharp I could cut cheese with it! No joke!While it doesn't feel as sturdy as Canon lens, I highly recommend these lens to a photographer looking for a good deal.