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Message: <blockquote data-quote="Yomper" data-source="post: 99788" data-attributes="member: 12240">HiI have a new d5100 bought from jessops a few days ago. i have put the lens on when i first bought it and left it on until today.  for the first time i thought i would go through my manual and look at the buttons and see what they do etc. i read that dirt is a no no on entering the camera so thought i would look at mine and have a look at the mirror, i have noticed a sort of mark all around the edge of the miror a bit like a smudge but in a square pattern and straight and equal all around the mirror. is this a normal mark as it looks in a perfect shape to be a smudge</blockquote>