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I remember once reading guide at about no less than 2/3 of imaging focal length.
That simple equation misses at least two determining factors - differential flex and mirror movement (if you aren't using refractors).
What's worked best for me is an off axis guider and a high sensitivity mono guide cam. Since switching to these two components for my guiding - its been spot on (four imaging periods over several hours) for about three months now. It's rare I can't find guide star (I don't change the orientation of the OAG ever).
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