Thread: Going to grind first mirror ever for 6" Long Focus Reflector - Need some help...
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Old 23-11-2019, 10:27 AM
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Merlin66 (Ken)
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Merlin66 is offline 		 
Join Date: Oct 2005
Location: Junortoun Vic
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Yeah,
that would be worth while - the mirror may be acceptable.
You could also check with a Ronchi grating and centre of curvature - at f9 the lines should be pretty well straight.
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