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Re: [PanoToolsNG] huuuuge panohead :-)

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  • paul womack
    ... Since the rotation of the earth is known, they either use a fixed clockwork (normally a very precise worm wheel and drive) or are guided . This is done
    Message 1 of 5 , Apr 2, 2009
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      Fabio Bustamante wrote:
      > This photo left me thinking...
      >
      > I suppose telescopes may request some considerably long exposures to
      > shoot stars, galaxies, etc. They must need an extremely precise
      > gyroscope system to stop all rotations and get an absolutely steady
      > image.

      Since the rotation of the earth is known, they either
      use a fixed "clockwork" (normally a very precise worm wheel
      and drive) or are "guided".

      This is done by pointing a guide telescope (on the same mount
      as the "real" telescope) at a nice bright star,
      and using a feedback loop (on the scope drive) to keep the bright
      star fixed.

      This allows long exposures on stars (and other things) which are
      not so bright.

      BugBear
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