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I know you have said no newt , but have you look at the new faster mirrors being produce now which will give no ladder viewing for a 20 inch dob , i know Mike lockwood produces very fine mirrors at these f ratio's.If you talked to Peter Read at SDM he would be able to give you some useful information about this.
just a thought
phil
Last edited by sally1jack; 01-02-2013 at 08:42 AM.
Reason: adding information
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