I'm a member of a small team sharing a scope at SRO in California. We have an AP1600 with absolute encoders. The scope is currently a Planewave CDK14 and prior to that it was a Ceravolo 300. We have done unguided tests while debugging guiding issues with both scopes and I wouldn't consider the results acceptable. That wasn't a surprise. IMO, unguided imaging is only likely to work with refractors.
Cheers,
Rick.
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