I use the Sony SAL50F18 1.8 / 50mm at my Alpha 550, am an amateur. A major reason for the purchase decision was the good reviews, the interesting price. I find no drawback to the visual comparison of images to other, more expensive lenses. Maybe I see the differences just do not? Or visible only in the lab? That's why the lens is also far enough for me. Auto-focusing is very fast, and accurate, The picture quality is far better than the Sigma 18-250mm my universal objective. Noise when focusing might be a little quieter. In total, around a good, and for my purposes far ausrechendes lens.
