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Dew on secondary mirror...

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#1 Calzunen

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Posted 25 September 2020 - 02:07 AM

I have a skywatcher explorer 150pds and 2 nights in a row I had dew covered my secondary mirror and the data was ruined.

 

are there any good dew heater for this?

I have found these:
https://www.teleskop...-2--holder.html

https://www.teleskop...er-D-31-mm.html
 

I don't want to make one myself because om not that good with these kind of things. 

 

I have read that the glue can melt and the mirror can drop on the primary.

True?

 

Dew shield is another option, I made one myself but if it's windy outside it acts like a sail... But how effective are they really?

https://imgur.com/gallery/ukvdyM5


Edited by Calzunen, 25 September 2020 - 02:27 AM.


#2 Mazerski

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Posted 25 September 2020 - 06:12 AM

You can try making a shield for secondary out of Reflectix (bubble wrap coated with Mylar). See photo.

 

I don't trust myself to take too many things apart... you can get help and have a Kendrick heater placed inside mirror housing - you will need a Dew Controller with this route.

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#3 junomike

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Posted 25 September 2020 - 07:21 AM

I found the one's offered by R-Sky to be reasonable (cost) and effective.


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#4 Calzunen

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Posted 26 September 2020 - 11:37 AM

I bought this one : https://www.ebay.co....ug/282039789170

hopefully it will help



#5 junomike

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Posted 26 September 2020 - 11:42 AM

I'm sure it will help however it is made for Finder not Secondary. 

Keep us posted as to how well it works.


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