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equipment damage - My viewfinder is dirty or damaged? - Photography Stack Exchange
Tons of dust inside SLR viewfinder prism. I just cleaned the mirror, both sides of my lens, and the outside of the viewfinder. Just bought this camera on eBay and seller rated
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How to Safely Clean Your Camera's Viewfinder and LCD Screen – CameraKlean
nikon - How to clean the focusing screen? - Photography Stack Exchange
How To: Clean A Viewfinder | Matthew Durr Photography
Why to never touch that focusing screen – thefoxtakespictures
How to clean the view finder / remove dust inside finder Canon 60D (DSLR) - YouTube
Cleaning your DSLR sensor & viewfinder | What I see, How I see...
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D750 scratched viewfinder?: Nikon FX SLR (DF, D1-D5, D600-D850) Talk Forum: Digital Photography Review