Binoviewer Comparison Page
This table below is a direct ray trace of how a particular clear aperture and optical path will interact with a set of eyepieces. In the columns below it is broken down into three different f/ratios. These f/ratios cover many important applications and represent a best case scenario to a worst case scenario. F/11.5 is a typical f/ratio for an SCT when using a binoviewer. F/7 is using the binoviewer a Refractor or SCT with a focal length reducer (FLR) in place giving roughly a 40% reduction off of the f/11.5. F/5.2 would represent a worst case scenario when a telescope such as a Dob is used with an optical corrector.
The Figures below are the Full optical path of the binoviewer considered. EX: A 20mm plossl in the scopes focuser in contrast to the eyepiece holder of the binoviewer. The Optical path figures below are the difference in mm.
Newtonian Diagonal Analysis
by Mel Bartels
http://www.siebertoptics.com/DIAGONAL.HTM <<<Check figures here
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