I got myself into a situation here... I was trying to clean off some dust in my cam, and I accidently scratched one of the lenses inside. I dunno if you call it the lens but it's the part above the mirror, where I can see the focus points etc. They are faint scratch marks done by my fingernails (and I dunno why i was cleaning so hard), but then when I look through the viewfinder, I see the marks very clearly.
Just to ask, is my camera doomed? I took some pictures of white things and I don't see the marks, but it disturbs me that it is scratched. Is the camera spoilt already in this sense? Can Nikon do anything about it? And will it cost alot to change the part?