had a distortion line in glass right through the middle of the lens.
ordered DIN10 and received DIN11. my use is as long ND filter for long time photos during the day. with this one I can shoot around 3:30 with f/22 during sunny days. and around 5:00 with f/22 during cloudy days and when sun is not present. good is the green color is in whole area same, no problem to remove it using change white balance in Raw format. hot glued it to the lenshood, it is little wider than cokin P filters, I bet it can be cut down easily to precise size.