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RE: [ccd-newastro] FOV Question

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  • Wodaski Yahoo Groups
    The FOV of view on my C14 is consistent from night to night. I have the mirror locked, so the focuser always is at the same location for a given temperature.
    Message 1 of 2 , Feb 1, 2003
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      The FOV of view on my C14 is consistent from night to night. I have the
      mirror locked, so the focuser always is at the same location for a given
      temperature.

      Ron Wodaski
      author of The New CCD Astronomy
      http://www.newastro.com


      -----Original Message-----
      From: Paul Luckas [mailto:luckas@...]
      Sent: Friday, January 31, 2003 10:47 PM
      To: ccd-newastro@yahoogroups.com
      Subject: [ccd-newastro] FOV Question


      With a dual focuser system (e.g. LX200 with NGF-S) does the field of view
      change slightly if you find fine focus at different positions from night to
      night (presumably from changes to the course focuser) ? I seem to recall
      discussions regarding focal length variations with SCTs that use movement of
      the primary mirror as the course focussing mechanism, and am trying to wrap
      my mind around how this may subtlety affect the field of view. Any comments
      ? Ron ?


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