I am very new to this forum and this is my first post. In recent I noticed that my Nikon D3 photos starting at F8 to F16 (on 50mm 1.4G lens) have few dark spots and small tiny thread like substance. I have cleaned the mirror and nothing looks odd to me from naked eye. Haven't tried through any magnifying glass.
Can some expert will help me to know from what part of camera these spot are appearing. And is it worth to get it repaired from Nikon Repair center. If anyone know how much I will have to spend on getting it fixed.
Have attached a snap from my camera which show the issue I mentioned above.
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