I've been using methanol or denatured alcohol, freon, etc. to clean front
surface mirrors or lens elements for over 22 years. There has only been one
mishap: I cleaned the inside surface of the front element of an old Minolta
50mm 1.4 and the coating practically wiped right off.
It was totally ruined.
John
Camtech
Garth Wood wrote:
> At 06:14 AM 3/21/98 -0500, John Hermanson <omtech@xxxxxxxxx> wrote:
> >
> >Lens tissue wrapped around a narrow flat object, dipped in denatured alcohol
> >works for me. Don't press too hard on the mirror as the silver can come
> >right
> >off if you trap a piece of grit in there. If there is old mirror foam in the
> >corners, that'll smear around alot and you'll have to clean it 10 to 20 times
> >to get it all off.
>
> John;
>
> Fascinating! I've known several disasters when people tried to clean their
> mirrors using alcohols of various chemical formulae. I assumed (wrongly, it
> appears) that alcohol on the mirror is about as dicey as alcohol on lens
> coatings. Perhaps they were simply pressing too hard!
>
> Anyone know more about this?
>
> Garth
>
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