Out of all of my observing and/or imaging sessions over the years, only one (1) was cut short by dew. The mistake on that night was to take just one optic and no observing plan, or a plan for dew management for that matter. That was years ago.
Dew is frequent and heavy around here, so I usually have spare finders (or even OTAs) waiting in the car or in the house. A quick swap, and the observing continues. If needed, I just switch to some other item from the list of things I'd like to do, which is always
much longer than could be achieved with 1 optic during 1 night anyway.
Quote:
Originally Posted by Stonius
I wonder why it is that moving air (which is exactly the same temperature as the still air) doesn't deposit dew?
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Alex (mental4astro) has elaborated quite a bit around that topic. His posts both here and on CN (maroubra boy) are worth finding.