Summary: The teleconverter works great. My photos are as sharp connected to the 70-200 G lens as without it. There is no degradation in quality in my experience. This adds a great option to my kit! I have no reservations recommending it. Naturally, as a longer lens, camera stabilization is important either with a tripod or fast shutter speed.
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 - For me its a win-win
Summary: I spent a long time debating 70-200 with this TC or 70-400 without TC. I decided I'd rather have the really nice 200 and a not as nice 400mm zoom with the combo. I'm happy with the decision and when using a tripod this TC works great.
Summary: I use this with my Sony 300mm f/2.8 lens. If I had written this review a year ago I would have not given a favorable review. Teleconverters are hard to use and get good results. I have learned to take my time and trust my histograms and make needed exposure adjustments. Then it works well.
Summary: If you check under the compatibility section of this site, you will not find this information. This lens only fits certain "matched pair" lenses. The SAL70200G, SAL30028G, SAL135F28 to be specific at the time of this review. (Each of these lenses were > thirteen hundred dollars each!) We'll see if Sony takes it back.
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: This little guy is compact and lightweight. I added it to my G series 70-200mm lens. A few preconceived notions I had were dispelled almost immediately. They said the f stops would need to drop by two by adding this. I thought I would have to make manual adjustments. I did not. When you power on, the lowest two fstops are removed as an option, and even in auto exposure, the pictures are exposed properly. Excellent shots with this fitted behind the G series lens.