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Just check to make sure the scope you bought is actually imaging setup. Newtonians come in two types, visual and imaging capable. Skywatcher sell both types. The visual models are configured to allow eye pieces to achieve focus with the range of the focuser travel. Imaging capable models are setup to allow cameras, like DSLRs, to achieve focus. Cameras need to be closer, often not able to be cranked inward sufficiently. An imaging Newtonian can usually also be used visually, if you have a shirt extension tube to fit in the focuser, allowing the eye piece to sit a bit further out. Hope that helps.
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