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I have the book as well. The secondary on my 16" is 88mm. What's your focuser height? The reason being you can make the secondary smaller by using a short focuser. Have you read page 96, the last three paragraphs seem to present the options for you. I think the telling advice is to resist buying a secondary that is too small.
Last edited by glend; 03-01-2014 at 07:43 PM.
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