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Is 1/4 wave good enough for a rich field?
I ran into a great deal on a 6" f/4 parabolic mirror. All the stats on it
look good, except that it is a 1/4 wave mirror. I was raised believing that no less than 1/8 wave will suffice, but how about a low power rich field scope? The magnification would never be greater than 40. |
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