Best pratices for Wide Aperture lenses (what are ?)

Wide angle + wide aperture = rejected images in LPC.
What's recommended ?
- Use a chart (same size) with bigger squares
- Move less (right/left)
- Combination of both (!)
Wide aperture is where corrections are the most needed.
I'm surprised that the LPC algorithm doesn't start with
small aperture images and then finish with wider apertures.

I believe there is a recommendation in the shooting guide that suggests to use a checkerboard with a larger square when calibrating fisheye/circular fisheye lenses, because of the large amount distortion at the image periphery. The specification of the correct (smallest) screen size of the checker square becomes more important.

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