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Hubble construction

  1. Feb 23, 2014 #1
    I did a cursory search on the forum, and I browsed Wiki.....but maybe I missed it.
    What is that big Flap/Door on the end of the scope.?
    Is it part of the optics, or is it a protection device, or a.....?
    Thank You
  2. jcsd
  3. Feb 23, 2014 #2


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    Gold Member

    It's the aperture door. It closes to protect the optics from sunlight.

    Read more here:
  4. Feb 23, 2014 #3
    Thank You.....
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