Summary: I bought this 1.4 teleconverter because I cannot afford the 12,000 dollar 500mm telephoto lens. I thought I'd try this on my 70/400 mm telephoto lens. Problem is I cant manually focus the long shots, which is why I bought this. So I have this expensive piece of gear for moon shots. For now. All the Canon and Nikon guys have them, not sure why they have them, but I'll ask next time I go out. It looks good on my camera!
Summary: If you need a little extra range with sacrificing auto focusing with SSM drive lenses and your F value ramge this is the teleconvertor for you. I use this with a Sony 70-200 G Series and it works very well. I have tried alternative teleconvertors and they usually do not match the auto focus drive system. These are usually too slow in response wasting time and battery power. Overall an excellent choice for matched Sony equipment.
Summary: I use the Sony 1.4x Teleconverter with my Sony 300-2.8 and it is as clean as if it was the lens by itself. WOW. The 300 is still very fast at 3.5. I am so impressed that I purchased the 2x converter also.
Pros: Durable, Easy To Use, Improves Product Function, Lightweight
Summary: If you got the 70-200mm Sony G lens then this is a natural addition and the lens is not complete without it. It works flawlessly including auto focus with the Sony Alpha 100(and I assume the A 700) Sony SAL-14TC 1.4x Teleconverter Lens for Sony Alpha Digital SLR Camera
Summary: I Bought it before I went on a cruise to the Norwegian Fjords. Brilliant teleconverter that allowed me to get closer to those far places I wanted to take pictures from. The teleconverter made the difference!!!