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Hi Nik
The original donut was not centred properly so it was removed. This home-made one is rougher looking, but has the advantage of being in the right place - and of course, the centre of the mirror is not used in image formation. This is my third Newtonian - they have all had slightly misplaced donuts. Cheers, Ray.
Last edited by Shiraz; 22-07-2023 at 10:36 AM.
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