Summary: ORIGINAL REVIEW: Do not buy this lens for a Sony NEX 6! In theory, it's just fine, and it worked fine when I received it, so I set it aside for an upcoming vacation. The first time I tried to use it in the field, though, the camera would not recognize the lens, would not focus, and would not shoot. Google the thread "sony nex 6 lens not recognized" and be warned. The lens is apparently made loose and the contacts don't connect well -- at least to the NEX 6.
Excerpt: Sony doesn't offer, as of yet, a hi-end long e-mount telephoto for their nex system. Because I like the compactness and autofocus capabilities of native lenses I bought this. It did not give me the color pop or contrast of other lenses like Sony's 10-18 ultra wide zoom, Zeiss 24 prime or Sony 50,1.8. Autofocus is slow. Don't expect to use this for sports or wildlife unless the subject is stationary. However, the images are reasonable. I'll continue to use this lens.