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asaintAdministrator
Carpal Tunnel


Reged: 04/25/03
Posts: 2094
How to Dehumidify a Telescope new
      #2569936 - 08/09/08 07:00 AM

How to Dehumidify a Telescope

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lukman
super member


Reged: 06/27/04
Posts: 159
Re: How to Dehumidify a Telescope new [Re: asaint]
      #2570104 - 08/09/08 10:00 AM

Excellent Review!!! Thank you...

--------------------
Lukman


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Michael Miles
professor emeritus


Reged: 02/11/05
Posts: 730
Re: How to Dehumidify a Telescope new [Re: lukman]
      #2570226 - 08/09/08 11:38 AM

Hi Dan:

That was fun. In the spirit of someone who would do a CNC convesion of a milling machine just to make one-off telescope parts, I salute you.

Of course, you could have just gotten a Newtonian and skipped the whole thing...

Michael

--------------------
LXD-75 w/
Stellarvue 102ED
Hardin 10" Newt
Antares 8" Newt
Meade AR-5
Meade N-6
Celestron 102mm refractor
Canon 300D, Meade DSI guiding


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mcoren
Pooh-Bah


Reged: 01/11/06
Posts: 1403
Loc: Virginia, USA
Re: How to Dehumidify a Telescope new [Re: Michael Miles]
      #2570816 - 08/09/08 06:20 PM

Nice job Dan! A very creative solution to the problem, if not just a bit of overkill. But, hey, that's what makes it fun, right?

Back in my SCT days, I would just put a baby sock over the visual back (to keep the spiders out) and allow the exchange of air in the heated/air conditioned house to dry things out in time for the next night.

--------------------
Mike

Disclosure: I have received, and continue to benefit from, atoms that were fused by stars in the early universe, most notably carbon, oxygen, and nitrogen, and an assortment of others.

Orion SkyQuest XT10 Dob
6" f/8 Home-built Dob
Celestron C8 OTA (late 80's)
Vixen Super Polaris mount

Suburban Washington DC



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highfnum
Carpal Tunnel


Reged: 09/06/06
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Re: How to Dehumidify a Telescope new [Re: mcoren]
      #2570864 - 08/09/08 06:45 PM

well someone figured it out ! I will try on my 9.25

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JFWall
newbie


Reged: 05/20/08
Posts: 4
Re: How to Dehumidify a Telescope new [Re: highfnum]
      #2572860 - 08/10/08 06:59 PM

Interesting idea but I prefer using the "KISS" principle.

Get a buddy bottle filled with nitrogen. They seal optical scopes for firearms with it to prevent just this problem. When your ready to go out, fill her up with a blast of nitrogen and your good to go. "KISS"

John


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Mr. Bill
Postmaster


Reged: 02/09/05
Posts: 5219
Loc: Northeastern Cal
Re: How to Dehumidify a Telescope new [Re: JFWall]
      #2574583 - 08/11/08 03:02 PM

Very clever...

I found that my Cat Cooler would exchange the humid air inside my C11 for dry outside air pretty efficiently though.

It will clear up internal condensation in a matter of minutes inside the house.



--------------------
The night sky is the palette....
My optics are the brushes....

The Milky Way is the masterpiece

Member IDA



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Larry F
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Reged: 05/24/04
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Loc: Westchester, NY
Re: How to Dehumidify a Telescope new [Re: JFWall]
      #2574729 - 08/11/08 04:15 PM

Quote:

Interesting idea but I prefer using the "KISS" principle.

Get a buddy bottle filled with nitrogen. They seal optical scopes for firearms with it to prevent just this problem. When your ready to go out, fill her up with a blast of nitrogen and your good to go. "KISS"




I don't know how you'd keep the system sealed; eventually the nitrogen would leak out. Which suggests an aftermarket solution: a small tank that bleeds nitrogen into your SCT during the observing session and during post-viewing temperature equilibration via one of the accessory-mount screw holes.

--------------------
More stuff than I need
Not as much as I want
(Main scope: CPC800/Mallincam Color Hyper Plus)
Mason & Hamlin BB 2140 mm (grand piano)
Westchester Amateur Astronomers
My Gallery


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Brian Gibson
member


Reged: 10/17/07
Posts: 93
Loc: Oakville, Ontario
Re: How to Dehumidify a Telescope new [Re: Larry F]
      #2575142 - 08/11/08 07:13 PM

I have been using 8" SCT's (Celestron and Meade) here in Ontario, Canada since 1980 and never had an issue with internal humidity. A dew cap over the corrector plate solved most of the dew problems and a Kendrick dew heater took care of those nights where everything was soaked in dew. I always keep the scopes in the house but allow sufficient time to cool down when taken ouside or to warm up and dry off when brought back into the house.

Brian


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deSitter
Still in Old School


Reged: 12/09/04
Posts: 6438
Re: How to Dehumidify a Telescope new [Re: Brian Gibson]
      #2580220 - 08/14/08 03:30 AM

The air inside your scope I assure you was good Yankee bracing winter air. You can't bring a scope into a warm house, where 10 times as much water is dissolved in the warm air, from the cold outdoors, and not have condensation on it, unless you live on an airless or waterless planet.

In any case such things are completely harmless, other than producing insignificant dust stains on the mirror and corrector, which are just the price of outdoor use. On the other hand, your elaborate mechanism will do nothing but increase the chance of injecting dust and other large particulates into the inside of your scope while doing nothing whatsoever to protect it.

-drl


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greedyshark
sage


Reged: 10/31/05
Posts: 437
Loc: 3rd Rock
Re: How to Dehumidify a Telescope new [Re: deSitter]
      #2590728 - 08/19/08 02:01 PM

Quote:

...your elaborate mechanism will do nothing but increase the chance of injecting dust and other large particulates into the inside of your scope while doing nothing whatsoever to protect it.




...not to mention the outgassing of the pump mechanism itself. Don't believe me...try enhaling from the pump airhose...not exactly clean air coming out of there. Who knows what effect it will have on your optical coatings over time.

Charles


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starrancher
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Reged: 06/09/09
Posts: 2601
Loc: Northern Arizona
Re: How to Dehumidify a Telescope [Re: greedyshark]
      #6002525 - 08/02/13 02:13 AM

I think it's excellent . Next to spending the money on a cat cooler , a great idea .

--------------------
LXD75 AR5
LXD75 SN8
Series 4000 Plossls
Misc. other stuff


Fort Rock , Az .


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