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15539Re: very large diagonals

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  • Greg
    Jul 1, 2007
      It's true for visual use on large observatory scopes as well. The
      club I am in occasionally rents the 60 inch telescope at Mt. Wilson
      for a night of visual observing. The eyepieces for that scope are 4
      inchers. And at that it still give only a narrow field of view due to
      the very long focal length of the scope.


      --- In William-Optics@yahoogroups.com, SiriusGuy@... wrote:
      > Relative to the inquiry about 2-inch diagonals, I believe that some
      > observatory telescopes have used sizes even larger than 2-inch,
      again mainly to
      > deal with the field of view issue. Of course, with all of the
      newer ones
      > typically NOT being for direct visual usage, this must now be uncommon.
      > Alan Birnbaum
      > Fresno CA
      > ************************************** See what's free at
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