I have a Bolex H16 Reflex, with a serial number that should date it to 1972. I have tried to shoot with it once, but found once I had the appropriate gel 85ND filter and f-stop - the image was so dark, revealing a layer of 'grime' (for lack of a better word) in the viewfinder so that I could barely make out focus. Alas, I just recanned the film and came here.
When I adjust the eyepiece diopter, it reveals a layer of scratches when focused to itself (that seems to be a separate issue), but when I focus to the ground glass, this aforementioned layer of grime comes into view. Could this buildup by inside the viewing tube or on the ground glass itself? I have attached a photo of this buildup.
Any tips on how to clean this? I've taken apart the viewing tube to clean it myself to no difference.
Additionally, any recommendations for places to get a Bolex some CLA and potentially upgrade it to S16?