It's all about the focal point of the camera and standard Dob won't have enough in-travel for a camera. They are setup for eyepiece use. If you had bought the imaging newt version you could achieve focus. Your options are afocal camera attachment (after an EP) or move the primary up the tube enough that the camera can achieve focus. If your new to this then don't try moving the mirror but just get an afocal EP, Hyperion make some at reasonable cost.
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