I have an opticron scope and opticron make all the necessary adapters to connect any DSLR to any of their scopes. Mine is the 66ED which with the connector gives a 1100mm focal length in 35mm terms so dial in the 1.6 conversion for my 20D gives 1760mm equivalent. The set up gives you automatic exposure (ie fixed aperture but exposure controlled by auto shutter speed) but manual focus of course. The main downside is the aperture is about f14 so have to use high ISO. Tripod and cable release essential!
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