Re: Misc. SCT questions
- From: Chris L Peterson <clp@xxxxxxxxxxxxxxxxxx>
- Date: Thu, 01 Nov 2007 17:19:35 -0600
On Thu, 01 Nov 2007 16:09:23 -0700, Tenifer <tensorsurfer@xxxxxxxxx>
wrote:
I sold my Celestar 8 in 1998. I plan to buy it back but first I need
to know
how much (in percentage) do the mirror coatings deteriorate after
almost
10 years? Also I assume only mirror coatings degrade and not the AR
coatings in the lens corrector?
Mirrors in SCTs tend to be very robust if the tubes have been reasonably
well cared for. I've got one that's over 20 years old and the mirror
looks as good as new.
Correctors are pretty robust as well, but the coating will definitely
degrade if they aren't kept clean and get dewed up regularly, or get
certain acids, pollens, salts, or oils on them.
Problems with both the mirror and the corrector are going to be pretty
obvious. If the mirror looks nice and clean, and you can see the AR
coating on the corrector is fairly uniform, you have little to worry
about.
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
.
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