With the raws, I followed the advices from Aurelien Pierre https://discuss.pixls.us/t/hugin-pano-hdr-darktable-in-scene-referred/27087
Instead of hugin, I used my former Kolor Autopano (600 Mb tiff image 
)
my next try will be to consider the focal lenght ([quote=“jonathanBieler”]
taken with a Super Takumar 200mm, probably around f8 [/quote]
this is my first try with dt 3.8.1, 15 000* 6322 pixels
