The TTArtisan 75mm f/1.5 is a fast portrait prime lens with M42 screw mount.
TTArtisan produced a clone of
Carl Zeiss Jena 75mm f/1.5 Biotar from the 1960s with their lens with the same characteristics of the Biotar, but with modern types of glass.
Its body is all metall.
The camera connection with the M42 thread is chosen so that it can be adapted to almost all current camera systems, except Nikon F.