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

[Chuck Vaughn <aa6g@aa6g.org>]

Mike,

> I noticed that the link showing the graphs was no longer
> available.

Re-read my post. I re-posted the graph at the new link.
 
> 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:
 
> 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.

I think it is more likely that the coatings were poorly done. But if you
can prove that air pollution degraded coatings (from acids?) then cleaning
them on a regular basis would be a good idea.

Chuck <aa6g@aa6g.org>

----------------------
 
>> 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


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