I've got a scratch in the AR coating on my SMP. It's in a place where it only shows when the light hits it just right (between the 11 and 12 indices). It's about a cm long, and I can feel it with my fingernail. Again, it's really hard to see, but it bugs me. The question is: Does it bug me enough to do anything about it? The answer lies largely in what it would take to fix it. Any thoughts, ideas, or answers born of experience?