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I can't give you an exact answer Peter, but I owned a 16" skywatcher dob for a while, and at about 6 feet tall, I definitely needed at least one step to reach the eyepiece when pointing straight up (or anything higher than about 60° if memory serves). Given the width of the base, this means you're kind of leaning in towards the scope, which your back will not thank you for over an extended period.
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