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Re: [Telescopes] Digest Number 590

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  • rander3127@aol.com
    In a message dated 10/1/00 12:06:20 AM Eastern Daylight Time, telescopes@egroups.com writes:
    Message 1 of 1 , Oct 1, 2000
      In a message dated 10/1/00 12:06:20 AM Eastern Daylight Time,
      telescopes@egroups.com writes:

      << From: callforjim@...
      Subject: Re: Binoviewers: The reality

      Question: How much light is lost? Would it be less than practical to use
      binoviewers with anything less than 6" or so? (not counting the moon.) >>

      Well, consider the length of glass path the light has to travel through.
      Several inches. Absorbtion accounts for a fair bit of true loss, but the
      splitting of the light cone into two parts accounts for far more of it.
      Using a binoviewer on an 8" scope reduces it's light to that of a
      5.6" scope. So deepsky viewing is severely effected. For planets,
      it's not a big issue.
      -Rich
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