Have a look at the difference between the curvature as shown by CCD Inspector of the Baader Mk3 vs the Paracorr Type 2 in this link from SGL.
I use the Baader as well so I was shocked by how much curvature it introduces.
However I have never noticed it in my images.
https://stargazerslounge.com/topic/3...ing-on-200pds/