I have retried this with an RC8 (200mm f8) and an ASI290MC. Jupiter and Saturn were in good position so I also threw in a Bintel x2 Barlow for good measure and got up to f16. Skies were clear but seeing was lousy - very high humidity and lots of instability. So the results were lousy.
I have since picked up a cheap GSO 8 inch f5 newt with a bung focuser. That’s my current project.
However, I must say I have not found the Barlows I have been using achieved anything like decent results. I have never had a Power,ate so I can’tbcompare. Are they really worthwhile?
Peter.
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