You asked
Is the voigtl nder portrait heliar 75mm f 1 8 good for portraits?
Yes, on paper it's a sensible portrait lens. At 75mm on full frame it sits close to the 85mm focal length that the Portraits guide calls the classic choice. You stand far enough back to keep faces in proportion, and f/1.8 gives you soft backgrounds. It's made for Sony E, Nikon Z and Canon RF on full frame.
The catch is that it's manual focus only and not stabilised. For posed portraits that's fine, but if you shoot moving subjects or kids, autofocus will serve you better. If you want autofocus with a similar view, the Portraits page lists the 85mm f/1.8 and other options.
Written by Claude from this site's pages.