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Date: 06 May 2007 22:49:38
From: MA
Subject: lense cleaning
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What is the consenses about removing and cleaning lenses
on an 80mm C-80 F7.5 or any system for that matter? Do people venture into
that with good results? I was looking at minein sunlight and they certainly
could use a wiping. Isopropyl alcohol I presume and soft cotton cloth.
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Date: 07 May 2007 22:53:22
From: Mike Simmons
Subject: Re: lense cleaning
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On Sun, 06 May 2007 22:49:38 GMT, MA wrote:
> What is the consenses about removing and cleaning lenses
> on an 80mm C-80 F7.5 or any system for that matter? Do people venture into
> that with good results? I was looking at minein sunlight and they certainly
> could use a wiping. Isopropyl alcohol I presume and soft cotton cloth.
Unless it's really filthy it probably doesn't need cleaning as much as you
might think. Optics always look bad in sunlight. It's one of the dangers
of solar observing -- you're never satisfied with how the optics look!
As has been pointed out, the usual "rubbing alcohol" is 70% alcohol and can
have other stuff that you don't want to use. You can get good lens
cleaning solutions at good camera stores but be sure they know what they're
doing there (I use a store staffed by pros who know how to care for their
very expensive gear). Lint-free tissue is available from a number of
sources but be sure it's also free of any abrasive fibers.
Mike Simmons
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Date: 07 May 2007 22:52:53
From: Brian Tung
Subject: Re: lense cleaning
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Mike Simmons wrote:
> Unless it's really filthy it probably doesn't need cleaning as much as you
> might think. Optics always look bad in sunlight. It's one of the dangers
> of solar observing -- you're never satisfied with how the optics look!
The trick is to look at the optics from the eyepiece end--I've never
been terribly dissatisfied with how they look from there. :)
--
Brian Tung <brian@isi.edu >
The Astronomy Corner at http://astro.isi.edu/
Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/
The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/
My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.html
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Date: 08 May 2007 12:42:00
From: MA
Subject: Re: lense cleaning
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"Brian Tung" <brian@isi.edu > wrote in message
news:f1p37l$qhk$1@praesepe.isi.edu...
> Mike Simmons wrote:
>> Unless it's really filthy it probably doesn't need cleaning as much as
>> you
>> might think. Optics always look bad in sunlight. It's one of the
>> dangers
>> of solar observing -- you're never satisfied with how the optics look!
>
> The trick is to look at the optics from the eyepiece end--I've never
> been terribly dissatisfied with how they look from there. :)
>
What gets me is what appear to be tiny bubbles in the glass. Maybe I am
mistaken.
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Date: 08 May 2007 17:34:47
From: lal_truckee
Subject: Re: lense cleaning
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MA wrote:
>
> What gets me is what appear to be tiny bubbles in the glass. Maybe I am
> mistaken.
Bubbles in the glass won't clean off, so you gain nothing by the
attempt, and risk much. Desist.
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Date: 06 May 2007 17:17:35
From: thad@thadlabs.com
Subject: Re: lense cleaning
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On May 6, 3:49 pm, "MA" <M...@nospan.com > wrote:
> What is the consenses about removing and cleaning lenses
> on an 80mm C-80 F7.5 or any system for that matter? Do people venture into
> that with good results? I was looking at minein sunlight and they certainly
> could use a wiping. Isopropyl alcohol I presume and soft cotton cloth.
Isopropyl is good; make sure to get the "pure" variety and not the 70%
solution sold as "rubbing alcohol" which may contain junk like
lanolin.
What I use is this:
<http://www.mgchemicals.com/products/824.html >
which I buy at a local electronics store. Similar should be available
at any
good drugstore.
Kleenex, by brand name (and unscented and unlotioned), would be better
than cotton since it contains no recycled junk and isn't as abrasive
as
cotton fiber.
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