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Since you're also thinking of astrophotography... you may want to consider something like a Skywatcher Flex-Tube where you can adjust the distance between the primary and secondary mirrors.
Solid tube Dobs often don't have enough "inward" focus travel for cameras, without the use of extenders. Taking shots of the entire Sun and/or Moon are a great way to get started with astrophotography, and it's much easier if the whole object fits into the one frame.
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