From: georgea{at}cam.org
To: CSC 
Cc: Atm 
Reply-To: georgea{at}cam.org


Thanks for the warning Colin, I had planned on checking them. I bought the
parallel plate in case the filter was either too thick (possibility) or the
surfaces were not flat and parallel (within reason).

George Anderson
Montreal Canada

Clear skies and good health


Quoting CSC :

>
> Regarding the 6" dia x 3/8" thick filter plates, I purchased
several for
> windows, and found them to be not very flat, which is o.k. for filters in
> some apps, but you'll need to touch them up, I think.
>
> Colin

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