Summary: On the A58 the pictures are clear and sharp. I've been using mine mainly for outdoor sports, something that was specifically said to be something this lens isn't suited to in professional reviews. In my experience, it's a great lens for that purpose. The quick AF and wide range with a long zoom work fine. Maybe using the newer A58 camera helps over older models with this lens.
Summary: I am very pleased with this lens. I am not a serious photographer but have been taking pix for 50 years with all types of cameras and lenses. Using it on a Sony Alpha A77 it has been just fine. It seems fairly "small" for a 300mm zoom, but the camera is big and it all balances nicely making for pretty good hand held shots. Twisting the barrel to zoom is not buttery smooth so I gave it 4 stars. It's not stiff, just a bit variable. It's a good lens for a good price.
Summary: Wow... I have kit lens 18-55mm, in my Alpha A77..Now I buy this lens and cant belive that is so big difference...! Im Speechless. Cant belive that is big different... Picture are cristal, great focusing, perfect quiet... Just love it....
Excerpt: I use this lens only when I need it to get in closer than I can with my other lenses. The few times that i have used it it has performed well. As with all telephoto zoom work you should use a tripod for rock solid stability and clairty of image focus. I use this with the A77 and the in camera image stabilty works well with this lens even in hand held situations.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Nice Bokeh
Excerpt: AS far as image quality goes this is a very good lens. I can get sharp images all the to 300mm handheld if the shutter speed can be kept high enough, otherwise a tripod is needed. Sharpness drops off a little above 250mm but not much. It is lightweight so easy to carry. For me the only real weakness of the lens is focus speed. It is slow to focus and tends to hunt more than other lenses I've used. For my use that is usually not a problem.
Pros: Consistent Output, Easily Interchangeable, Lightweight, Very Sharp
Summary: This lens works well with my Sony NEX 7. Requires the intermediate adapter to fit. Definition holds reasonable well thru the zoom range with some degrading at full zoom. I recommend it for images requiring about half its zoom range, useable to the full zoom with a reasonable amount of sharpening and definition enhancement in post processing. All in all a good lens worth the price and is certainly convenient.