TTartisan will soon announce a new 50mm f/0.95 APS-C manual focus lens for Nikon Z cameras. TTartisna currently has a 50mm f/1.2 and a few other APS-C lenses for Z-mount:
New TTartisan 23mm f/1.4 APS-C mirrorless lens for Nikon Z-mount released
Released today: TTArtisan 40mm f/2.8 APS-C macro lens for Nikon Z-mount
TTartisan lenses are also sold at:
Via PhotoRumors