[Chaos-l] Fwd: [UncensoredTakGroup] Re: Help! TOA130 lens coating problem

[Mark Montazer]

Interesting read Allen, Explore Scientific recommends using 94% isopropyl
alcohol on the optics of my scope. I've used it on the correct plate and no
problems so far.

I do use spray on DEET during mosquito season, but I leave the observing
area before applying it. I've also read that exhaust fumes can have an
adverse effect on coatings as well.

Mark


On Thu, Nov 1, 2012 at 10:11 AM, E. Allen Davis <starstorm151 at embarqmail.com
> wrote:

> THIS is a forward from a thread on the Tak group about damage to lens
> coatings.
>
>
>
> Interesting what the follow up says about use of DEET etc.
>
>
>
> i also know from personal experience that anything with alcohol can damage
> mirror coatings.  i used some cleaner years ago on my mirror and it caused
> a bluish haze with a certain part of my mirror.  seems the alchohol bonds
> with compounds in the coating.
>
>
>
> This is one reason I always spray DEET on a paper towel and rub it on
> skin.  I don't ever spray insect repellant near the scope or eyepieces.
> thankfully we are out of mosquito season for a little while.  i actrually
> hope we get some colder weather this year to help with bug populations next
> year.
>
>
>
> just some interesting info...i feel sorry for the guy with the TOA 130
> allen
>
> E. Allen Davis
>  starstorm151 at embarqmail.com
>
>  "M'Illumino              "I am enlightened
>  D'Immenso"              by the immensity."
>
>    -Ungaretti               -Ungaretti
>
> ------------------------------
>
>
> The problem doesn't appear to be the result of abrasive cleaning. It
> appears the coating was exposed to a chemical of some sort. I did a little
> quick research and discovered that the chemical component of insect
> repellent DEET (diethyltoluamide) can damage lens coatings. Also, some
> folks use moth balls to dissuade insects from getting into their equipment
> bags and cases. Moth balls contain the chemical compound
> 1,4-dichlorobenzene (para-dichlorobenzene, p-dichlorobenzene, or PDB) which
> can damage lens coatings.
>
> Alternatively, acids have a damaging effect on optical coating as well.
> Using optical equipment in proximity to chemical plants or near industries
> that utilize acidic compounds in manufacturing, there is a probability of
> acidic emissions resulting in acid rain or acid dew. If this comes in
> contact with coated optical systems can result in damage over time. Lens
> coatings are intentionally removed using acid, but usually this results in
> damage to the optics and requires replacement.
>
> Not a solution to your problem, but could shed some light on your issue.
>
> Scott Busby
> Belmont Observatory
>
> --- In UncensoredTakGroup at yahoogroups.com, "mackey" <hojong.lin at ...>
> wrote:
> >
> > Don't really know what happened. My friend noticed strange 'scratches' on
> > his TOA130 objective lens. Here are some photos:
> >
> > http://farm9.staticflickr.com/8194/8137649431_b27d3191bb_o.jpg
> > http://farm9.staticflickr.com/8473/8137649357_b440c6c1f2_o.jpg
> >
> > He can't recall any sandy wind incidence which may be the culprit.
> >
> > Pictures of bright stars also showed ugly spikes:
> >
> > http://farm9.staticflickr.com/8308/7941835164_f251c3b71f_o.jpg
> > http://farm9.staticflickr.com/8439/7984289825_33e00f2bdb_o.jpg
> >
> > Anybody knew what might seem to be the problem?
> >
> > Thanks for any info.
> >
> > Hojong Lin
> > Taipei, Taiwan
> >
>
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