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Personally, I think 200X is bare minimum for looking at planets. A 6mm eyepiece gives you 208X which is close enough.
For me, a 5mm eyepiece giving 250X would probably be as high as I'd go in a dob - and I'd quickly start getting annoyed with tracking the planet.
Try your 9mm with a Barlow. At 278X, you will either be impressed at what you see, or impressed with your self for keeping the planet in the field of view. Or find it darn annoying.
Good luck.
Renato
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