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58696Re: Question about flat's positional angle

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  • wenjehpeng
    Jun 30, 2007
      --- In ccd-newastro@yahoogroups.com, Yahoo - Wodaski <yahoo@...> wrote:
      > The dust motes that cause those shadows are usually either on the
      camera itself, or on the filter wheel. For most setups, rotation will
      rotate both, so the dust motes will not change due to rotation.
      What may - or may not - change with rotation is the overall
      illumination of the frame. If something is off-center, rotating the
      camera could result in flats that are subtly (or glaringly) different.
      The only way to know for sure is to try it and see if the flats works
      after rotation.
      > Ron W

      You are always so kind to newbie's question. Thank you.
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