Gary,
Your problems are inherent. The corrector cools faster than the surrounding
air and condenses moisture on the glass.
Step 1: Buy an Insulated Dewshield from Richard Just at
ricvic@...
Step 2: Put away your Kendricks, it can't keep a 14" glass plate dry.
Step 3: Allow the tube to breath after humid weather and keep desicant in
the rear port (scope looking up) when not in use.
Step 4: If in doubt, unscrew the secondary retainer ring, remove secondary.
Be careful of the mirror surface. Blow warm, dry air in from the eyepiece
port end. This should dry out the tube prior to use. Also, do the same if
it condenses up inside again. The seconday is keyed and can only be
replaced in the correct orientation. If you are careful, you won't even
need to recollimate.
Hope this helps,
Wayne E. Gondella
AFA Engineering Company
Pittsburgh, Pennsylvania
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Date: Thu, 16 May 2002 20:36:51 -0000
From: "garynburk" <garyburk@...>
Subject: Question re: Moisture in OTA
Hi all,
This past Tuesday evening I was doing some ccd imaging when I noticed
that a raw image seemed out of focus. I was unable to sharpen the
focus much, so I finally looked at the corrector on my C14. It was
badly "dew'ed" around the secondary mirror, . . .
Thanks for your interest.
Regards,
Gary
