Dealing with Humidity While Stargazing: Is It Worth It?

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Discussion Overview

The discussion revolves around the challenges of stargazing in humid conditions, particularly focusing on the effects of humidity on telescope performance and visibility of celestial objects like Mars and the moon. Participants share personal experiences and techniques related to observing in high humidity environments.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant notes that high humidity can cause telescopes to fog up, questioning whether this is an unavoidable issue for stargazing.
  • Another suggests that allowing the telescope to warm up to the ambient temperature can mitigate fogging, recommending to avoid taking it directly from an air-conditioned environment.
  • A participant mentions their scope manual advises leaving the telescope outside with lens caps on for half an hour to equalize temperature, emphasizing that temperature variations can affect resolution.
  • One user shares a successful experience after pre-warming their scope in the car, noting improved visibility of the moon but expressing disappointment in the detail observed for Mars, suggesting potential issues with eyepiece selection or collimation.
  • Another participant reinforces the importance of allowing time for both the telescope and the observer's eyes to adapt to the dark, which can enhance the viewing experience.

Areas of Agreement / Disagreement

Participants express varying opinions on the best practices for observing in humid conditions, with some agreeing on the importance of temperature equalization while others focus on the specifics of equipment setup and adjustment. No consensus is reached on the effectiveness of different methods or the reasons for the perceived lack of detail in observations.

Contextual Notes

Participants mention specific techniques and personal experiences without resolving the underlying issues related to humidity and telescope performance. The discussion reflects a range of assumptions about equipment and environmental conditions that may affect observations.

Who May Find This Useful

Astronomy enthusiasts, particularly those interested in stargazing techniques and equipment handling in varying weather conditions, may find this discussion relevant.

kleinma
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I tried to check out Mars and the moon the other night with my new orion dob.. but it was so humid that the scope got all fogged up... is this just something you have to live with? Are nights of high humidity just bad nights to go observing?
 
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if you take a scope out of a A/Ced house or car into warmer night air it will fog in a hi H envro.
if you let the scope warm up this will not be as big a problem, by leaving it out of the cooler places or turn off the car A/C unless dew actively is falling at the time.
 
My scope manual says to leave it outside with the lens caps on for half an hour to let the temp equalize. Even without condensation, temperature variations will lower the resolution of the scope.

I used to just crack open my window and view from there though.
 
last night i put the scope in the car about 45 min before we went out... it worked much better.. also the humidity wasnt AS bad last night... first thing i pointed at was the moon.. awesome to see it with so much detail... obviously the easiest thing to find in the sky.. Mars we found with ease, but I was a little disappointed because I thought we would get a little more detail with it... it seemed less red through the scope and not all that much bigger than the naked eye... maybe we were doing something wrong.. because i tried using different eyepieces to increase the view.. but still couldn't see it any better
 
Originally posted by kleinma
last night i put the scope in the car about 45 min before we went out... it worked much better.. also the humidity wasnt AS bad last night... first thing i pointed at was the moon.. awesome to see it with so much detail... obviously the easiest thing to find in the sky.. Mars we found with ease, but I was a little disappointed because I thought we would get a little more detail with it... it seemed less red through the scope and not all that much bigger than the naked eye... maybe we were doing something wrong.. because i tried using different eyepieces to increase the view.. but still couldn't see it any better
If that was the case, see if the scope came with detailed collimation (alignment) instructions. That could be THE problem, and changing eyepieces should have definitely made an obvious difference.

What kind of scope, and focal length, and what focal length eyepieces are you using??
 
Originally posted by russ_watters
My scope manual says to leave it outside with the lens caps on for half an hour to let the temp equalize. Even without condensation, temperature variations will lower the resolution of the scope.

This is key. This same time can also be used to allow your eyes to dark-adapt (takes ~15 minutes).
 

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