Re: [APML] life of a CCD (and Filters)

["Mike Cook, AF9Y" <mwcook@concentric.net>]

Chuck,

   I was around then but did not remember this discussion.  Thanks for
posting it.  I noticed that the link showing the graphs was no longer
available.  Anyway it is good to know that at least the lumicon filters
can take that much cleaning and remain in good shape. 

  But, I did find the discussion about cloudy RGB filters which had
to be replaced.  Maybe it was some sort of air pollution.   Here's
the email thread:

   
To:             	sbig@yahoogroups.com
From:           	Derrick Farley <derrick@lh-dome.demon.co.uk>
Date sent:      	Sat, 9 Feb 2002 02:06:39 +0000
Subject:        	Re: [SBIG] CLoudy RGB filters
Send reply to:  	SBIG@yahoogroups.com


I had a similar problem with my filters some time ago, I sent some
flatfield data frames taken with the offending filters to SBIG and they
were replaced
Derrick

 Tan Wei Leong <weileong@singnet.com.sg> wrote:
>I just took my CFW8 filter out for cleaning. Noticed that the "other" side
>of the RGB filters are cloudy, tried to clean it but can get it off. I think
>the coatings are bad already.



From:           	Chuck Vaughn <aa6g@aa6g.org>

> Mike,
> 
> >> From what I've heard, the color filters will have to be replaced
> > before the CCD.  I believe the complaint was that the coatings
> > breakdown over time, probably as a function of exposure to
> > high humidity.
> 
> I wouldn't be so sure about that either. :-) Were you around when
> I ran the filter cleaning test? If not, here is my summary.
> 
> http://astro.umsystem.edu/apml/ARCHIVES/APR98/msg00611.html
> 
> The image is now located here:
> 
> http://www.aa6g.org/Astronomy/clean_test.gif  (60KB)
> 
> Chuck
> 
> 
> --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
>              Unsubscribe at <majordomo@seds.org>
> 



Mike Cook, AF9Y
http://www.af9y.com
mwcook@cris.com




--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>