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Cleaning and restoring vintage cameras
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==Focusing screens== '''the one that is the most fraught with peril''' Focusing screens in SLRs are plastic Fresnel lenses more often than not. They are pretty delicate and are easily scratched (the plastic is not particularly hard). DON'T use anything that is harder than the plastic screen to clean them. This includes brushes with plastic bristles. DON'T use anything that will rub grit against the screen (like a cloth or lens paper). I use an artist's brush I found at an art supply store. The handle is made of plastic. I heated it with a butane lighter and bent the handle at a right angle, near the tip, so I can get at the focusing screen with it better. First I gently brush at it for a while (dry) to loosen and remove any grit. Then I dampen the brush with distilled water (just damp, NOT wet) and go over it several times. Just gently brush at it, don't scrub, cleaning your brush every so often, until it is clean.
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