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Guide scopes will generally work fine where your main imaging scope has a focal length under 1200mm
Any thing over that an OAG is advisable
I image with 900mm and 1000mm focal lengths ( newts ) and both scopes use an Orion 60mm guide scope with helical focuser ( guide camera is a ZWOASI120MM-S USB3 ) Both rigs guide beautifully on their EQ6-R pro mounts
Cheers
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