I purchased a Nikon 28mm 2.8 AIs MF lens from a seller on amazon. He purchased the lens new from BH in 2013 and included the receipt. He paid 499 plus tax. The buy it now was 299 so I thought it was a good deal for a 3 year old LN lens. Unpacked it day and it looks great, then when I examine the rear element through a flashlight I notice a small spot. Gently run my finger over it and I can feel it. I tried to clean it, doesn't rub off. Looks like a scratch. Although its not a line, more of an oval type shape. Maybe he dropped it, who knows. Anyway I'm furious. Should I return it? Or would that spot not show up on images? Its not in the center of the glass, its very close to the perimeter. Its hard to see looking straight through, have to angle the lens so the light catches it. wish I could photo it.