Anti-fog Cleaning Cloth to avoid dew in refractor? - Forums

Topic starter

Dec 30, 2021 · Edited: Dec 30, 2021

I have been using this kind of cleaning clothes for my glasses and my camera recently, it works quite fine in winter, so I was wondering if it could be a cheap solution to avoid dew in a small refractor. I know it is not the best solution, but I would like to know if it could help in some way or it could have negative effects on the scope lenses. This is the kind of product I am talking about: Anti-fog Protection Glasses Cleaning Cloth

If you need to know, the aperture of my refractor is about 60 mm and it has already a dew shield.

Many thanks in advance for your suggestions!

Dale Penkala

Dec 30, 2021 · Edited: Dec 30, 2021

If your trying to stop dew, my suggestion is to get a dew heater strap for your objective lens. I would avoid touching an objective unless it needs to be cleaned and then it need to be done correctly as to not damage the coatings on the lens. So my answer is no do not use it.

M_Johnson

Dec 30, 2021

I have worn glasses for 61 of my 67 years. Tried everything to control fogging on them. I have found the anti fog sprays to be useless. The wiping cloths that you are interested in have left a "film" on my glasses. Far better than fogging up but in my experience there still is an obscuration. I bought these cheapie dew heaters from Amazon:

https://www.amazon.ca/gp/product/B07WJG9B5P/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

https://www.amazon.ca/gp/product/B075JKBN6D/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

First one was for the telescope and the second one was for the guide camera. They work great. They run off of a 5V USB wart.

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Sergio Moya Lara

Topic starter

Dec 30, 2021

I have worn glasses for 61 of my 67 years. Tried everything to control fogging on them. I have found the anti fog sprays to be useless. The wiping cloths that you are interested in have left a "film" on my glasses. Far better than fogging up but in my experience there still is an obscuration. I bought these cheapie dew heaters from Amazon:

https://www.amazon.ca/gp/product/B07WJG9B5P/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

https://www.amazon.ca/gp/product/B075JKBN6D/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

First one was for the telescope and the second one was for the guide camera. They work great. They run off of a 5V USB wart.

Thank you for your suggestion! I will check it out

Well Written Respectful

David Moore

Dec 30, 2021

A dew shield also helps especially in conjunction with a heater.

Well Written

Bob Lockwood

Dec 30, 2021

Dew is an optic killer, if the dew starts I shut down. If the optics have dust on them, and it’s unlikely they don’t, and it starts to dew up and you wipe it down with anything, your going to damage the coatings, even on small scopes it’s not worth it. I have had my current scopes, a 110mm and a 180mm and they have been cleaned once in the 8 years I have had them. Use a dew heater if you really need to image in those conditions.

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