Wow fantastic - last update only this morning! Half read it so far but:
“For ultra-wide lenses, only use rectilinear lenses, not fisheye lenses. Fisheye lenses are not recommended because they have too much distortion.” - is this particular to RC, which the author is using? I thought I read that RC is happy with fisheye.
Because this https://www.youtube.com/watch?v=8HuOvf4rKaw strongly prefers fisheye over wide rectilinear, principally using the ‘higher resolution’ (?) centre of each photo, the larger periphery as a sort of bonus for better context.