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Focal length H.. Not only focal lenght, but size of the telescope too..
A 10" F8 newtonian would require a serious mount to stop any vibrations, would likely weigh a fair bit I'd say it wouldn't fit in most of our cars. Yes, the average 10" newt is F/4.7, so its faster, but the people buying these RC's aren't concerned about fast, they really want the longer focal length of these scopes...
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