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Vacuuming newtonian mirrors lightly for maintainence

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5 replies to this topic

#1 CARL_MU1

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Posted 16 December 2019 - 01:37 AM

Any opinions on lightly vacuuming primary and secondary mirrors in Newtonians?



#2 luxo II

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Posted 16 December 2019 - 02:17 AM

Don't - it will damage the coating.



#3 Bob4BVM

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Posted 16 December 2019 - 02:36 AM

Safest way, if it really needs cleaning is to give it a bath

Lots of info here on how to do that, it also must be done right

light dust on a mirror has little effect on performance


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#4 havasman

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Posted 16 December 2019 - 03:06 AM

Welcome to the forums!

 

No.

 

Blow, don't suck. Get a Giotto Rocket Blower and use it carefully. Works like a champ.

 

The downside of banging your mirror's surface with a vacuum hose or brush is not worth risking. You're not going to suck the coatings off the surface but the chances of smacking the surface are not good given the potential for damage.

 

Above all, never inspect your mirror with a light. No mirror can look good in such an inspection.

 

Secondaries seldom get dirty. Mine never do as they live covered with a Chivas Regal bag hung from the collimation screws when not observing. It's the primary that'll need washing ~annually and will stand for blowing off now & then.


Edited by havasman, 16 December 2019 - 03:11 AM.

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#5 speedster

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Posted 16 December 2019 - 05:30 AM

This might be of interest:  https://www.cloudyni...orrector-plate/



#6 John Kuhl

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Posted 17 December 2019 - 01:20 AM

Don't do it.




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