u/Moshikowo

So I recently bought a Canon VI-T on ebay for $200 and almost all functions are working (aside from the 1 second shutter speed lagging). My biggest issues with it right now is the rotating prism for switching focal lengths is not clicking into each designated focal length, and is instead just moving fairly freely with almost zero resistance. Another issue is a LOT of fungus on what looks to be every single element inside the viewfinder/rangefinder. Is there a fix for the free spinning focal length selector and what should I do/avoid when cleaning the elements?