I can't get my lens up close enough to the Ronchi grating, so can't get a full disk view outside of focus to photograph.
Images inside show reasonable figure slight undercorrection in center, slight long outer zone.
Coating is junk on both the conic blank primary and 4" m.a. secondary. Secondary is supposed to be 1/10 wave, but I judge it more like 1/8.
I'm using a laser pointer aimed at a ballbearing in the perforation of the 12.5" flat to make a pinpoint glint. Laser light shows every speck of stuff doesn't it? Maybe I'll try a half dead battery to get it below the lasing level and just have a red diode.
133lpi Ronchi, inside focus.