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a couple of things,
you will need a T-ring to connect your camera
rings for the telescope (i assume it is a solid tube not collapsible)
some sort of collimation tool e.g. a laser
eventually you will want an autoguider and guide scope
you will need some sort of battery pack if you want to operate in the field
you wont need filters if you are using a DSLR
software ... there are a lot of good free options but a lot of people use photoshop
those are the only hidden costs i can think of but the big one for me is whether you can achieve focus with your DSLR through that telescope. some dobs are not designed for prime focus photography
hope that all helps
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