Looks like equirectangular is more suitable for a Milky Way pano. I always hate to see a rectilinear projection. The distortion is just too severe.
The 2pi sky pano just cover half of the whole sky, or a hemisphere. Looks to me a fisheye or a stereographic projection would be more suitable.
Another question here. In the normalization page, one can choose to use “add” or “multiply” or “add-scale” or “multiply-scale”. Do you mind explaining their differences? I would think that scaling means multiplication, but it looks like they mean two different things here.
Cheers,
Wei-Hao