I'm not at home this weekend while I work on my sitech drive at Cosmic Acres, but a thought occurred to me:
Given that this prototype's secondary hub assembly is quite a bit bigger than a stock one, and that it's CG is inboard of the corrector by maybe a couple inches, could the weight be distorting the corrector figure?
When I get back to town, I'll reassemble the scope and explore that with dpac. It should be possible to loosen the secondary hub in the corrector and rotate it incrementally to see if there might be a problem in the secondary. It should also be possible to loosen the corrector retaining screws to allow for rotation of the whole assembly incrementally, to see if the distortion rotates with the corrector.
But if it is the weight of the secondary that's the problem, I wouldn't have a problem mounting the secondary on a spider to take the load off the corrector. First things first, though.
Edited by tim53, 03 October 2021 - 11:50 AM.