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Steve,
PHD2 is probably the most successfully used guiding software on the planet
Here’s some info attached that may help you
Some key things that are a must -
Use Ascom pulse guiding method not ST4 method
Make sure you get a good calibration near the celestial equator and north meridian ( Dec near 0 )
Create a dark library and bad pixel map ( use either )
Correct guide camera and guide scope settings
Try a guide scope in lieu of an OAG if you OTA’s focal length is 1000mm or less
Good luck
Martin
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