I want to do more then just look.
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.
I knew a fellow who was actually building a Schiefspiegler but he mentioned that due to the optical configuration the Iry fisc would be slightly ovular. Not due to Astiatism or poor optics but apparently a product of tilted components or some such. He was never clear and I lost touch with the guy. Have you found the airy discs out of round at all?