You asked
What is the ttartisan af 75mm f 2 good for?
The TTArtisan AF 75mm f/2 is a portrait lens. On full frame it gives a true 75mm view, a comfortable step up from a standard lens, and f/2 gives you good background blur. On APS-C it frames like about 112mm, which is tight enough for headshots from across the room.
It fits a long list of bodies, so your camera decides a lot. For full frame, the Sony a7 III or the Nikon Z6 II are sensible partners. If you shoot APS-C, the Fujifilm X-T5 is a good match.
Longer lenses like this flatter faces because you stand further back. The portraits guide shows where it sits among the other portrait focal lengths, and the focal length converter explains the crop maths if you're switching systems.
Written by Claude from this site's pages.