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I have a 200mm f6 1200mm newtonian and had to move the primary mirror 50mm up the tube to achieve prime focus with my dslr camera. But I now need to use an extension tube with my eypieces for visual. Before I moved the mirror I could get focus with the camera using a 2x barlow lens.... but it made the scope 200mm f12 2400mm ok for the sun moon and planets but a bit slow for deep space.
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