The mottled appearance frequently is dried cleaning solution--these
coatings are pretty tough unlike mirror coatings. A professional
photographer I know cleans his Schmidt camera corrector plate with
Windex--try some on the edge. Don't spray it on--put a little on a soft
tissue or cotton ball after first making sure you have very gently
dusted the plate with a camel's hair brush or something similar.

Andy

Michael Fralish wrote:
>
> I was cleaning the corrector plate from the 10" LX-5 (1989) I recently
> purchased and noticed that some the coating has flaked off and has a mottled
> appearance. Does anyone redo coatings on correctors? Better yet, Is it
> worth redoing the coatings? The optics are otherwise excellent, but I
> wonder if the planetary performance is affected by the corrector coatings
> coming off?
>
> Michael
> #####################################
> Michael Fralish
> Minnesota State University, Mankato
> krypton.mankato.msus.edu/~fralim/mike.html
> #####################################
> "If nature were not beautiful, it would not be worth
> knowing, and if nature were not worth knowing, life
> would not be worth living."

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