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Re: Grainy image from horsehead nebula

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  • Mike Dodd
    ... Yes, flexure from an external guide scope makes long exposures difficult. The OAG sounds like a solution. Let us know how it works. -- Mike Mike Dodd
    Message 1 of 20 , Jan 24, 2013
      Mark Striebeck wrote:
      > Thanks for the encouragement Mike!
      >
      > My challenge there is that so far I could only manage to guide successfully
      > for 5 minutes. If I go longer I get too many failures. One of the main
      > issues (I suspect) is that I guide my SCT with a guidescope and not an OAG.
      > As soon as the filter wheel comes in, I can start using the new OAG (it
      > attaches into the filter wheel).

      Yes, flexure from an external guide scope makes long exposures
      difficult. The OAG sounds like a solution. Let us know how it works.
      --
      Mike

      Mike Dodd
      http://astronomy.mdodd.com
      Louisa County, Virginia USA N37.58.23 W77.56.24
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