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RE: Baffling Developments, And More.......
Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To Posted by Walter Hamler on April 18, 2000 00:23:09 UTC |
A recent issue of S&T that compared 8" dobsonians, commercial variety) had some answers to these and other questions. Basically, take the focuser height, racked in, + 1~1.5 inch, + the radius of the tube diameter, and divide the sum by the mirror f/ratio. Then add 0.5" for planetary use or 1" for photo field light coverage. There are other, more complicated math ways to compute, but the answer is almost always going to fall in between sizes available, so you kinda hafta choose!!
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