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I had to guess a few figures but I still processed the design with
Newt for windows 3.1 by Dave Keller.
The results are in the attached pic.
It looks like the 2" focuser they supply is too narrow.
Any ideas?
Also - just out of interest:
Contrast factor = CF = 5.25 - 5.1x - 34.1x²+ 51.1x³
where x is the obstruction ratio = 3.94/12 = 0.328 = 32.8%
therefore:
Contrast factor = 1.71.
Unobstructed = 5.25.
cheers
Allan
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