Summary: This lens works great for all general purpose pics. With one kid in sports and another learning how to walk, I needed a good lens that could take telephoto shots while also allowing me to take portraits and close ups with having to change lenses all the time. This lens does just that. It is a little bigger than the stock lens, but it appears to be a slightly bit smaller than the Sony 18-200mm lens.
Summary: Overall, great lens. The limited/slow f stop could be better. f3.6 at 18mm and f6.3 at 200mm. This makes it primarily a day-time lens, however... Image stabilization is the best of the NEX lenses. It's almost sticky-like. Why is this not talked about more!? You can move the camera around and watch it, it doesn't move or barely moves. This is much better than the Sony NEX OSS lenses (in terms of image stabilization).
Summary: I actually ordered this for my Sony A7 full frame knowing that I could use it in the APS-C mode. All functions work properly and it's a nice lens. I find it a bit soft at the telephoto end, even stopped down, and I've noticed that focus is slow (or doesn't work) in low or even dim light. It also seems to indicate that it got a focus lock at distances just inside the minimum focusing distance, meaning you think you got focus but you really didn't.
Summary: I tried to register this lens on the Tamron USA site and got an error code w/ the serial code provided on a piece of paper. No serial code was on the lens itself. No paperwork came with the lens. No booklet etc. The seller (D-Solution) claimed I could not get the six year warranty from Tamron because it was a grey market lens from Korea. He suggested I buy a year of expensive drop and break insurance from him.
Summary: The quality of the pictures are the same as the Sony lenses. Reason for the 5 stars is that you can carry a single lens to cover the 18-200mm range. Decently weighted to give you a solid feel. Unlike Sony lenses, when zooming the lend had a very rough feel to it. Could be a con for dinner people. Compared to the Sony kit lens (18-50 mm), when switching on the camera, the camera takes a slightly longer time to start up.
Summary: From my uses this lens is as good as the kit zoom, but with an 11.1 zoom ratio versus the kit's 3.1. I use it on an NEX-6 and is seems to focus more reliably than the Sony. IOW, I've had trouble with the Sony failing to focus, whereas while the Tamron 18-200 might take a small moment longer, it is more reliable. There is a zoom lock that prevents the lens from extending (zooming out) while hanging downward on your neck strap.
Summary: Wow! this lens is wonderful. Pictures are really sharp. Normally, these all-in-one lenses are not used at night, however, I tried it and the pictures I got at night are stunning. It is really worth the investment.
Summary: I have an NEX-5N and -6 and am considering this lens. But only 4 stars here for the price. It seems the identical lens is available on Amazon for about 120 bucks less. (I'm on mobile and can't add a link, but search for this same item at 590 dollars. It ships from Japan.) Edit: I just ordered it. Shipping from Japan is about 14 bucks for 2-4 weeks delivery. But for only 5 bucks more it's "2-3 days." Wow! OK, this is very weird.