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Jason, while the above I agree with there is some evidence from my own experience that suggests guiding with a focal length under half of your primary can lead to pronounced flexure issues. PHD and other programs do have the ability to guide as sub pixel but the longer your focal length against the guide scope the worse the flexure becomes. Combating flexure in the end is the real problem. Alex is probably right about OAG's and self guided cameras, although my experience so far is quite frustrating.
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