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Wow this is just fantastic work Dennis, a great find. I have looked at the thread over at CN and the process looks so straight forward and easy to do.
h0ughy i to would like to now what it would cost to make one, this would be great for my C8 and smaller refractors.
Just a thought i had, and it maybe completely impossible. But could something similar to this be used as a filter at the EP? I mean something that could be attached at the focusing end of the telescope. A 1.25" or 2" filter. I am thinking i guess along the lines of the Knife edge and Ronchi type focusing tools.
Regards
Fahim
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