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: 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.
Excerpt: I am not an expert photographer by any means; I know just enough to get by. I recently returned from a vacation trip to the Grand Canyon and although I took several other lenses, I found myself using this one pretty much exclusively. The convenience of the zoom means everything when you want to photograph everything!
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus
Excerpt: I bought this as a travel lens. I hate changing lenses when on vacation. I have used several Tamron lenses in the past and they have been great. Quality control is good and I have never been disappointed. I currently use two Tamron lenses on my Nikon D700 and this lens has similar high quality. Autofocus at 200 mm is not ery fast but I think that is a function of the Sony autofocus system not the lens.