I'd like to submit test photos for calibrating a lens for Chromatic aberration.
I've read the instruction at
https://wilson.bronger.org/calibration. However the article doesn't mention the focal lengths/apertures that should be used for the CA calibration photos. Should I take the photos at max. aperture or stopped down? I have this cheap zoom lens that I feel could use some CA correction, especially at the wide end. Pic related is a 100 % crop at f/11.