Summary: Most DSLR's come with a general purpose zoom lens. Though convenient, they do poorly in low light. This lens does much better in those situations. The 35mm focal length is wide enough for most general shooting. Though the focus mechanism is not fast enough for sports action, it's sufficient for normal shooting.
Excerpt: I have a Sony a580 and have been shooting at a maximum f/3.5 for the past 2 years. Why haven't I purchased this lens sooner?!?!?! Gorgeous, sharp images with smooth, creamy bokeh. I am utterly in love with it and don't see it leaving my camera body any time soon!!
Pros: Consistent Output, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Nice Bokeh
Excerpt: I could not be more pleased with the sharpness and quality of this lens- at a fraction of the cost for some of Sony's higher-end lenses, like Carl Zeiss. This lens, which I use with the Sony-SLT A77, will be a favorite for years to come. I love the look of the images I'm getting. It does a gorgeous job! The only "con" I would say is the mainly plastic body, but for the cost, handle it with care and it'll last a long time!
Pros: Consistent Output, Cost-efficient, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Nice Bokeh, Sharp
Summary: It takes great photos when it nails the focus but very often the focus was off even when the camera confirmed focus. I had to return it. I also have the 50mm 1.8 lens which works fine so it is not my camera. The focus issue was not only wide open, it was noticeable at f2.8, even f4. Maybe I got a dud, might give it another try in the future.
Summary: I decided to purchase the lense after I read good reviews and I was amazed especially in low loght . I used it in dark and it was like a daytime.The price is in mid range not expensive nor cheap.If you like to take pictures @ night that is the right lense. I use it with sony slt a57.