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Thanks Fred/Greg
No, as I said, the differential guiding feature was not available in the beta test unit - a real pity since I do have those guiding issues. So I used 'self-guided', i.e the internal tracking ccd which of course does not suffer the same fate as a guide scope.
You are right though Greg, the fact that SBIG have retained that second internal guiding ccd does set it apart - when you read my report, you will see that the very clever 'tracking ccd focus' mechanism completely resolved the elongated stars I was seeing on that guide chip.
cheers
Martin
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