Summary: My excitement turned to disappointment when I opened the box to find what looked to be a returned defective lenses. The hood and lenses were out of their plastic wraps and there was a mark or some kind of debris in the lenses. I purchased a new lenses and got something that was used.
Summary: The problem was the overly tight mount. compared to all my other lenses, this one was so tight, I was afraid something would break. I returned it and bought the Sony 35 1.8 and am very satisfied. I have many Sigma lenses, but this one just did not work out.
Summary: I had this lens for a year and a half and I wanted to love this lens. I gave it every opportunity and it did take a couple of great pictures but, it let me down in the end. The pictures that I took with it, didn't come out as crisp as I expected and maybe that is my fault for expecting so much.
Summary: Very good picture and build quality. However, my copy kept producing pictures with a noticeable black spot in the center. When I examined the lens, there was a large speck of dust trapped inside the lens. Returned for a full refund.
Summary: I would not recommend this lens over the 14-42 II kit zoom from Olympus. The sharpness is lackluster and a little worse than the kit zoom, flare is a problem and CAs are prominent. It isn't really much of a bargain when you consider it's only 1 stop faster than the kit lens.
Summary: .......and to make matters worse, Amazon's systems are so pathetic they have now asked me to review it! OK here goes. It looked great, but it wouldn't fit my camera. It was a Sony-fit version.