For sure this page is a bit of a mess.
Société Astronomique du Havre - Règle NPF : temps de pose pour éviter le filé d’étoiles
Input-referred Read Noise versus ISO Setting
https://apps.apple.com/us/app/starry-landscape-stacker/id550326617?mt=12
https://www.youtube.com/watch?v=5ZtoX5aBI8E
https://astroforumspace.com/category/astrophotography-tutorials/
For a single photo
https://www.lonelyspeck.com/milky-way-exposure-calculator/ Canon 50mm
Shutter speed 7 seconds
For stacked photos
https://photographylife.com/night-sky-image-stacking Turn off long exposure noise reductions C.FN-2 Turn off image stablisation on the long lens Set Tungsten white balance