I had gained my wide angle lens as a supplement to my 18-200er Zoom on the NEX 5N to do on holiday beautiful landscapes can. the lens is easy, well made and distorted wide angle only slightly, so it enters the "fisheye effect" with strong converging lines only on low. thereby see the photos even without finishing "naturally" from. I am not a professional, so I can not comment on the other optical properties, I am certainly very pleased with the lens.
