Quote:I may be done after this next test but it is so close that it is not going to be much longer. It is giving nearly identical star test images inside and outside focus. Star images are very tight to where it easily splits Castor and has improved even more with the last test. I am still awaiting clear skies to evaluate the last 15 minute correction session.
20 inch f8 Chief Ed Jones designed and a 17 f9 Zanbuto Wide Band Chief Mike Jones designed .Both unobstructed telescopes .
7x35 and 10x50 sears tower binocs, 3" f/10 edmunds reflector, 2.4" f/11.7 manon refractor, 6" f/8 jaegers refractor, 10" f/11 R30 Istar refractor, 3" f/15.8 sans&streiffe refractor, 3.1" f/15 selsi refractor(towa 339), 2.4" f/15 sears refractor, selsi 30x30mm spyglass, criterion 5-draw 25x45x75x spyglass(1957), 4.25" f/14.8 tasco 20te.http://cleardarksky.com/c/OmahaNEkey.html
Quote:I am assuming the DPAC test with a 3/4 width bend is 3/4 wave or is it half that ?
Quote:It is finally finished !!!
Quote:One comment I want to make about all the books I have read on testing refractor objectives and that is that none of them I read made it very clear as to which way the Objective faces during DPAC testing or if it really made a difference ....well it sure does !!!!
Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schiefspiegler,60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4" f/12, 4.5" f/16 & 6" f/12 Schupmann Medial refractors, 4" Celestar, 19 Stellafane awards 9 in optics Engineering = Taking what you have and making what you need.