I have a red 50-150 lens and it looks like there is some smearing or scratches on the surface of the glass. Optically I can't seen anything on the image i makes.
1. Am I worried about nothing?
2. If it is something to worry about should I try to clean it myself if it is some kind of shmuts?
3. If the coating is damaged can it be repaired? Any recommendations as to where I might send this lens?