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As Ken said a good tracking mount is essential for all but the brightest objects that can be shot with short exposures. It is possible to photograph through your dob, others have. However for DSOs you will need an equatorial goto mount that can handle the weight of the scope your using plus the imaging gear. Diving right into CCD camera, filters, etc can get expensive and frustrating, most people start off with a DSLR camera that is suitable for astrophotgraphy (not all are). There are a number of intro to astrophotography articles on the web that would be good to read. Be prepared for a learning curve and be patient.
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