Quote:
Originally Posted by Steffen
That would be an issue with real hair dryers, but the 12V foldable camping model I'm using barely puts out lukewarm air in a cold night. I certainly cannot imagine drying my hair with one (and I have very little). That makes these 12V hair dryers ideal and quite safe to use on optical surfaces. Restraint is the key, as with anything. You don't want the corrector or meniscus to actually become warm.
Cheers
Steffen.
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Or worse crack from thermal shock. But as you say moderation is the key. I am not sure if its a lasting handling though as I have done it myself in the past and as I recall the dewfreeness did not last long.
The Honders does 3 things, fan air extraction, open mirror air at the back with an opening around the mirror of around 25mm all the way round, thermal blankets, flocking of the main tube and dewshield and quite a long dewshield.
I used to use a simple wrap around insulation blanket on my refractors around the objective area (like those windscreen sun protectors). As long as you put it on before sunset it worked great. It did not work putting it on during the night as the whole point was to slow down the heat loss of the lens to slow down the dewing process. Simple but effective.
Greg.