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I'm hoping to use it for planets, the moon and double stars. It's easier on the eyepeice as well. I did some more grinding last night and the sagitta is back to 0.5mm, the surface is much smoother even after 1 hour of 120 except the outer 5mm which is still quite rough. At this F/ratio, would there be any noticable difference between a sphere and a parabola? Ralph
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