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Question ?

  1. Jan 27, 2005 #1
    i just bought a telescope and i am in canada it iz really cold outside and i want to take it outside to look at the stars but someone told me that moisture would get stuck in the lens and it would be ruined can somebody tell me if this is true personally i dont think it would but i dont want to take a chance of ruining it right away
  2. jcsd
  3. Jan 27, 2005 #2
    no it should not ruin the lens
    if you can put the scope in a place that it will cool befor you go out to use it
    like a garage or in a car as the hot scope will attract water from cold air
    that will make it hard to see thru it

    most good seeing is in cold clear weather so everone has this problem

    a cover called a dew cap is a good idea too
    or you can cover the whole scope with a plastic sheet
    when waiting for it to cool
  4. Jan 27, 2005 #3


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    Staff: Mentor

    I have a relatively new Meade ETX-105 and have used it in cold weather (about 15F). One problem (besides frostbite) is the adhesive holding the diagonal flip-mirror in place loses its stickiness and can fall off. Its not difficult to fix yourself if that happens, but it was scary/annoying for a new scope to have that problem.
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