You asked
Is the voigtl nder nokton 75mm f 1 5 aspherical good for portraits?
Yes, it's a good portrait lens, with a couple of caveats. On full frame, 75mm sits close to the 85mm that Portraits calls the classic portrait focal length. It gives a flattering perspective, comfortable working distance, and soft backgrounds at f/1.5.
Two things to weigh. It's manual focus only, so it's slower with people who keep moving. It also has no stabilisation. If you shoot on Sony E or Nikon Z, the APS-C crop gives roughly 112mm equivalent, which is a lovely headshot length.
If you're starting out, the Portraits guide explains why a good lens matters more than the body. Pair this one with a full-frame body such as the Sony a7 IV or Nikon Z6 III.
Written by Claude from this site's pages.