About five years ago, I found this lens laying on the grass near my apartment. It would get bounced around in boxes for years until I actually took up photography and had it dug out. Turns out it's an L series 16-35mm 1:2.8 I've taken some shots with it, with some great results. Problem is, there was never a lens cap for it. I took a picture of a blue sheet of paper. Someone said it woulddetect scratches. So I did, and I couldn`t find anything. I looked at it real close though, with a flashlight (the lens, not the pic) and I can see all these little teeny nics. I`m curious how much of issue this will be. Like I said...can`t really make out anything wrong in my pictures....but I`m also new at this.