I have a question about a Nikon F standard finder i recently got. I see that the inner wall surfaces of the pentaprism all show white dots, but they seem uniformly formed, do not look like fungus or other taint, the finder looks mint. I am wondering whether anybody has ever seen this before, or maybe there is really something wrong with the finder? maybe desilvering? but i see no other dirty stuff inside the finder. if it is the silver coating peeling off, they are so oddly separated.