Summary: excellent value.. but i also have the fisheye adapter and my personal taste prefers the fisheye. however this is still a very good ultra wide angle lens with minimal to no distortion that would be excellent for photographing architecture and tight landscapes.
Sony SEL16F28 16mm f/2.8 Wide-Angle Lens for NEX Series Cameras
CJ. Ric Zhou, Amazon
5 March 2014
Summary: I am not start to use it for outside shooting, but I try it in-door. I'm using Sony Nex-5r, and since it's APS-C format camera, the 16mm will not as wild as 16mm, but it's about 24mm. For couple minutes for testing, I feel the focus ring is a little bit hard to rotate it. Otherwise, I think it's good.