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23278Re: What the heck....a donut near M81?

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  • rdcrisp
    Feb 2, 2004
      --- In ccd-newastro@yahoogroups.com, mike_from_tn@y... wrote:
      > I did the light leak test last night with a 500watt halogen
      > worklight near the scope and all is well. Looks like a dark frame.
      > The artifact while present in the Ir filtered object and flat

      Not to belabor the point, but you did shoot the dark as a "covered
      aperture light frame" right? If you told it to shoot a dark, then the
      shutter would not open. The shutter needs to be open to be a
      meaningful test.

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