Here’s one to help with interpretation of Ronchigrams. This is for a mirror though, and so the interpretation needs to be reversed for refractor lenses:
https://nicholoptica...i-patterns.pdf
Here’s a good thread started by peleuba, who participates in this forum quite regularly:
https://www.cloudyni...-bench-images/
Yes, that's a good thread. Lots of opinions and some factual information discussed. The discussion gets into the deep end of the pool quickly pertaining to aberrations that can be detected in DPAC. Curvature in the bands as seen in the static images most of the DPAC practitioners post to CN highlight the spherical correction, zones and the edge condition (and sometimes coma and alignment errors) of the lens being tested. For me, astigmatism is easier to detect and quantify via the star test. Yes it can be seen in DPAC, for sure. But its difficult to photograph for evaluation later because to see it, you need to watch the bands "chock" and distort as you move through focus. Its nearly impossible to capture this well in a photo.
I have tested a very nice TSA102 back in January of 2020. Might have been a little better then this sample... but I will look on my server in my DPAC image repository.
With this info the tests make a lot more sense. Thanks for the links.
