Summary: I think it works fine. I am a bit disappointed by the major change to the f stop when using this converter, however, it does give me the ability to change my 300mm to 600mm. For this I am very happy.
Excerpt: The Sony 2x converter works very well with my Minolta 200mm 2.8 HS APO G lens on the A900. Wide open at f/5.6 the pictures are full of detail already but with very low contrast. Stop down slightly to f/6.3 will regain the contrast.
Pros: Consistent Output, Easily Interchangeable, Lightweight, Strong Construction
Excerpt: I used the Sony Teleconverter with A-77 for images of wildlife.Not up to my expectations, too much blur-free autofocusI gave up after two weeks of use and bought the Tamron 200-500.Pictures come out much better
Summary: I had to return the converter as the image quality suffers significantly. I used a tripod and used it handheld with the G series 70-200mm lens. The images were significantly reduced in their quality. I had to return the unit as it was unacceptable or me.
Summary: Phenomenal results I cosidered buying the zoom 70-200 with f2.8 or the 70-400 with f4-f5.6 Eventualy I bought the 70-200 with f2.8 wich is a piece of GREAT optics with unparalleled results AND the 2X convertor Most of the time I need the 70-200 and when I'm taking wildlife pictures I'm using the 2X...