Im being paranoid here. I read about cameras having coating on their mirrors and that touching the mirror would cause permanent damage.So how do I go about identifying any damage to my mirror. Wheb I look through the viewfinder, it's clear and theres no smudge or scratches. But how can I identify hidden damages??? Btw, im using nikon d5200
См. статью: How to identify damage on my dslr mirror?