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6924RE: [ccd-newastro] H-alpha filters

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  • Ron Wodaski
    Apr 1, 2002
      1. Yes, this is normal. The Ha filter is a pretty thick sandwich, and cannot
      be parfocal with thinner, simpler filters.

      2. I occasionally can find a guide star, but I use a guidescope because it's
      much more flexible with an Ha filter.

      Ron Wodaski
      author of The New CCD Astronomy

      -----Original Message-----
      From: remi lacasse [mailto:rmi.lacasse@...]
      Sent: Monday, April 01, 2002 6:57 AM
      To: ccd Newastro; SBIG user group
      Subject: [ccd-newastro] H-alpha filters

      A few months ago I received my H-alpha filter from SBIG.
      It is the Standard type and I would like to ask 2 questions to
      the group or to those who have used the same type filter before:
      - I am using an ST-10E with the filter installed in the empty slot
      of the CFW-8 but the focus point is very different from the
      other filters. Is this normal?
      - Is it possible to use (find) a guide star and if so what is the minimum
      magnitude through the filter? Or will I need an external way to guide
      when using the filter?
      Thanks in advance
      RĂ©mi Lacasse et/ou Lise Charlebois
      Lat. 46 deg.
      Long. 74 deg.

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