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Thanks Alex, that article is exactly what I was looking for (nicely written too:-). It seems that heat needs to be done properly if at all. I've never had much cause to control dew as my scope designs have not required much intervention, but I was curious as to the plethora of optic heating accessories and how that plays out.
I especially liked the following quote;
"Heat can be used on scopes, but it needs to be carefully employed. Secondary mirrors benefit from gentle heating as it eliminates potential problems from fan vibration. But heating a secondary is more complicated than just sticking a heater onto it. The secondary mirror holder plays a vital part in this. The wrong holder and it will render any heating efforts futile. Heating of the secondary is very effective as it is small and the heating system can be designed to quite uniformly and gently heat it. Heating of the primary mirror I would suggest is not the best option, for the optical problems un-uniform heating creates is the same as for fan cooling."
Made a lot of sense. Thanks a lot for the heads up about the article. Very informative! :-)
Cheers
Markus
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