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If you are seemingly nearest to good focus when the focuser is racked fully out, slide the eyepiece/extension tube assembly further out whilst still looking
through the eyepiece, and if you still can't reach focus then Philip is almost
certainly right. Having said that, even if the seeing is bad, you should still be able to get sharpish focus, even though the moon will go slightly in and out of focus as you watch it. I don't know how long an extension tube the
SW ED80 requires, did you get the SW one?
raymo
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