This lens I find very good! Dear writer of reviews I have a request: Before you rips something here tried it just before a try! Have the lens for DX format bought and also at the full frame (Nikon D600) tried and lo and behold, the self described by Sigma shadows in the corners do not exist! The camera needs to be set correctly. Best under "DX" to automatic. I repeat my request: First try and then write! Had the other objectives already established.
