I was reading back over some of the original posts from Dennis and noticed his red mask had a hole cut out in the center. While Maks, SCTs, and Newts will see no difference I started thinking about refractors. If we were to cut out the center obstruction hole that would allow more light to enter we would be able to focus on dimmer stars. However, I also wonder if the increased central portion of light would start 'washing out' the defraction patterns.
Any thoughts? I think I might try that experiment out at home tongiht with my papaer cutout for the 80 mm and see if there is a big difference.
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