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need advice: Parabolic primary -- d = 202mm RoC = 1562mm
I've been figuring a Pyrex 8" primary for a few months now. I use DFTFringe for testing. (Plus Foucault & Rochigrams)
My question is about the proper setting for the Gaussian blur when trying to determine the wavefront.
In my case, should I set it to 10% or 20% (or some other number) ???
I attach some pictures, including an R-gram (outside of R0C) for the mirror as it stands now.