Ed "You have to grow old, you don't have to grow up."
Active instruments: 4.25" f/6 Newtonian on altazimuth Springfield mount with crutch tripod -- telescope for the handicapped. 12" f/6 Newtonian Telescope maker since 1958; always more to come? Well maybe just one more and it will be something very special Stellafane Awards: 1977 1st award for 4" f/6 refractor 1978 1st award for 4" f/4 Lurie Aplanat 1983 1st award for Newtonian smoking pipe For Sky and Telescope articles, please see Bio info.
Longitude -85.42786 Latitude 39.5915 127mm refractor "Cosmos I" finished Apr 6, 2010 SP-C6 (Vixen 6" f/5) updated mar 30 2012 "current build 6 inch F6.5 "Little Toe" waining "if all else fails use duct tape "works for me" "Remember there is no spoon" "Rest in Peace Dad 10 apr 2010 1:43 pm"
Quote:And that's only a 0.2 degree field. A 2" eyepiece would provide up to a 0.56 degree field. Might a coma corrector be profitably employed, even though designed for a paraboloid of faster aperture? Or would it 'overcorrect'?
20" homebuilt truss dob 6" watson refractor
20 inch f8 Chief Ed Jones designed and a 17 f9 Zanbuto Wide Band Chief Mike Jones designed .Both unobstructed telescopes .
Quote:Also, when the DK is completed I will try the coma corrector for visual use. And I will report the results back here to add to the knowledge base.
Quote:A commercial coma corrector will substantially reduce coma, but won't eliminate it. You can see it if you enlarge the photograph's upper left corner. For some reason the same effect is not visible in the opposite corner.