02-08-2012, 07:08 AM
This guy had the same problem with the corners, but it happened only on NX200
http://verybiglobo.blogspot.com/2012/02/nx-16mm-f24-different-performance-with.html
http://verybiglobo.blogspot.com/2012/02/nx-16mm-f24-different-performance-with.html