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yeah mate, I have tried to refocus but the best I can get is a bit blurry. My collimation is out a touch, normal viewing is 99% crisp.
the EP and barlow are supposed to be "in sync" (I don't know the technical term) with each other so refocussing is not supposed to be required. That is certainly true when I switch between the 13mm and 9 mm EP I have.
I do have an F4.9 scope so I suppose what you have described is the problem, perhaps the barlow is altering the F ratio too far for the focusser to handle.
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