Excerpt: I use it with Sony a6000. This lens is much sharper and faster than the standard 16-50mm that comes with the 6000 as a kit. It certainly comes closer to exploiting the real possibilities of the a6000 than the kit lens. It may not be the best lens available, but considering the price, it is a very good deal. It makes a disconcerting rattling noise if you shake it (gently) or when you turn the camera on, but the auto-focus works without fail.
Pros: Consistent Output, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Nice Bokeh
Excerpt: Image quality on the Sigma 30mm f2.8 is nice for a lens in this price range. Looks great and is compact. However, there is no manual/auto focus switch on the outside, which means you can only switch between the two in-camera. So, don't buy this if you're planning on using it with the Black Magic Pocket camera. Some people report that it works fine with their pockets, but it definitely did not with mine.
Pros: Easily Interchangeable, Lightweight, Nice image, Strong Construction
Excerpt: Despite it's clunking sound when the camera is not on this lens produces very crisp images and extremely nice colors. In combination with a Sony a600 this is a must have lens for beginners as for pro photographers.
Pros: Consistent Output, Fast / accurate auto-focus, Lightweight
Excerpt: Have not used the lens a lot but by my informal tests, shooting pics of my cats, the lens is sharp at most f stops. From 3.5 to f8 it's very sharp. I can't comment on the manual focus as at this point in my life the auto focus is better than I am.
Excerpt: Purchased this Sigma with my Sony A6000 and was impressed with it's look and performance. It's a bit on the slow side, but looks and feels perfect on the A6K. The results are very good too. I don't think you can beat the performance /cost ratio. My only beef is that it doesn't allow you to use all the auto focus tracking on the A6K.
Pros: Consistent Output, Easily Interchangeable, Fast / accurate auto-focus, Lightweight
Summary: I own the newer, silver version of this lens. I run it primarily on a Sony Alpha A6000. By now everyone knows the good... it is a good value, prime lens for your e-mount Sony body. For the price, you will have to go with an older adapted manual for anything sharper. For what it is, it is wonderful. The drawbacks... ** It can be painfully slow depending upon lighting. So much so that if I am shooting a portrait, I grab a manual 30yr old 50mm prime / adapter.
Summary: The Sigma 30mm/2.8 is not particularly impressive to look at- that tiny front element is more than adequate, but some people like to see a big chunk of glass. It is, however, pretty impressive in performance, especially given the price. I bought mine to use with my Lumix MFT cameras as a complement to the various kit zooms I bought with them, and for that use, I'm pleased.