This is my DSLR negative scanning setup and process
Just a stub for now, I will add more details in the future
I scan with a Canon Rebel EOS T3i using the standard 35-55mm lens at 55mm with the following settings in aperture priority mode: ISO 100 @ f11, auto shutter speed and white balance.
I use Darktable for Linux, along with a few modules. Most notably the negadoctor module.