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How serious do you want to be in your visual exercise?
A 10 inch dob is a glorious thing and could last you a lifetime. Once the aperture bug bites it is hard to resist. While certainly the bigger the mirror the deeper you can go, this can be offset by effort to use (with a bigger scope). Best size is the one you will use.
I loved my 8 inch until I got my 12.5 inch which I adored until the 15 inch arrived. I would love to go bigger but as I age I prefer to keep my feet on the ground so the 15 is likely as big as I will go.
Regardless of which size dob you get, save some money for (or get ready to build) an adjustable height chair…it is a thing I use every time I observe. It truly adds more to my viewing pleasure and capability than a high end eyepiece.
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