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the beauty of a dob alt-az mount is that while you are moving it in 2 axes, you do this simultaneously ie you just grab the top of the scope with your paw and move it. Simple. I view at high power and move the dob and sketch. It becomes second nature and is quite intuitive. I find observing with a dob very easy and while it would be a little easier for sketching to track, it's really not that hard. And a 10" is not that much more effort to move than an 8". But I would say that setting up with a 10" dob would be considerably quicker and simpler than setting up an 8" on an EQ. Especially if each time you will have to polar align the scope, even roughly. It's quicker to set up my 16" dob than my ED80 on CG-4 EQ even though I have the tripod position marked.
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