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ill let janoskiss answer this one, but in layman's my crayford focuuser on my 10" is much smoother and subtle to tightly focus than the normal rack & pinion focusser that i have used on the 8" versions of my scope.
It feels silky smooth. It is adjustable, so that when i have a heavier eyepiece or an iimaging setup in, then I can tighten it up as needed.
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