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At Katoomba on Saturday I viewed Jupiter with my 8" f/5 Newtonian. The seeing wasn't great and the best view I could get was with a 12mm Pentax XF eyepiece giving only 83x magnification. It was possible to push the magnification higher but then I was hardly ever getting a sharp image. With planetary observation sharpness is more important than magnification, and sometimes the seeing conditions just don't allow high magnification.
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