ART Viewfinder brightness not uniform

Marix

OT Supporter
May 23, 2006
27,969
My film SLR viewfinder is brighter at the bottom third than the top two thirds. It's like an paid down graduated ND filter or something.

I've cleaned the mirror and focusing screen with a rocket blower. What could be causing this? Do I need to clean the pentaprism or something?
 

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