It is a very well built lens with super optics. Auto focus is fine. Great zoom range and really expect to get a lot of good wildlife photos with it. Works very well with both my A 900 and my A 99

I have both the 70400G and the 70400G2. I don't really see a difference between the two. Sony says the G2 is faster focus, but I cannot tell the difference. They are both Very sharp at the 400 mm end and I use F8-f16 on both. The photo of the bug is at 100% of the pixel size and the wing is super clear. I shot that with the G2 at around 4-5 feet away. The firewood if over 100 ft away and is also at 98.9% of it's Pixel size and both were hand held with steadyshot on. You can save some money and buy the original G lens.... Read More  Hide

I used the original 70-400mm on a couple of occasions and received the new one as a Christmas gift from my father. The quality is sharp and focuses much faster then the original model. Even at 400mm the images come out sharp and crisp. The only complaint I have is there is no lock on the lens when your walking. It will zoom all the way out to 400mm so be prepared.... Read More  Hide

I had been using a borrowed SAL70400G so I was already aware of what a great, sharp lens this is. My new lens is used with the A77 II and the focus is fast and accurate. This is a winning combination for bird photography. I love the tracking and focusing features of the A77 II What I am terribly disappointed about is the white finish on the lens outside seems to be substandard. I have had it just about a month and already there are several deep scratches in the paint finish and the body material shows through. I am careful with my equipment; it is not due to abuse. The lens is stored properly and not banged around when in use.... Read More  Hide