Mamiya 645 AE Prism Finder Mirror (funk)

[mangorockfish]

Pulled my 645 out yesterday, turned it on, looked through the view finder and saw this corrosion looking stuff along the inside top of the viewfinder. Looks kind of like the silver is coming off a mirror. Is this something to be really concerned about and if so who should I send it to for repair? Thanks

 

[cgw]

Desilvering. Age-related usually in prisms and reflex mirrors. Annoying but zero-impact on your images. Not cheaply or readily fixed. Live with it?