SBIG 11002 guide chip focal length

Discussion in 'General' started by Marshall Edgell, Nov 5, 2017.

  1. Marshall Edgell

    Marshall Edgell Cyanogen Customer

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    Does the guide chip have the same focal length as the main camera? If not what is it?

    marshall
     
  2. Doug

    Doug Staff Member

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    Cameras don't have focal lengths. They do have a pixel size. And in the case of the FW8G-STXL, there is a focal reducer in the assembly.

    Are you talking about an STL or an STXL?
     
  3. Marshall Edgell

    Marshall Edgell Cyanogen Customer

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    Doug

    I thought there might be a focal reducer involved. I have an SBIG STXL 11002 on a 2939 focal length telescope. What would the focal reducer bring the focal length down to for the guide chip?
     
  4. Doug

    Doug Staff Member

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    The self-guiding wheel incorporates a 0.7X focal reducer for the guide camera.
     
  5. Marshall Edgell

    Marshall Edgell Cyanogen Customer

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    I assume this means my guide chip focal length is 0.7 x 2939mm or 2057.

    Sorry to be so ignorant.

    marshall
     
  6. Doug

    Doug Staff Member

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    Approximately, yes.
     

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