So it doesn’t refer to the EXIF data imported from camera with each photo, but still works out focal length, distortion (also anything else, I wonder?) from scratch for each pic, then takes the average and applies that to all of the photos that are incuded in an EXIF grouping?
Whereas, for photos not incuded in an EXIF grouping, it works out and applies focal length, distortion to each photo individually?
So nowhere is it possible to rigidly state ‘this is the EXIF data - trust me - use it just so’?
If so, sounds like yet another weird, misleading name for a setting.