You asked
Is the ttartisan 90mm f 1 25 worth it?
Whether it's worth it depends on how you shoot. The TTArtisan 90mm is a manual-focus prime with a maximum aperture of f/1.2, and it has no stabilisation and no autofocus. Those two limits matter most. If you like slowing down and focusing by hand, it's a lot of lens for the money you'd expect to spend on a fast 90mm. If you want autofocus or a camera that steadies the shot for you, look elsewhere.
On full frame it frames as a true 90mm. On APS-C it acts like a roughly 135mm, which suits tight portraits from a distance. It fits a wide range of Sony E, Nikon Z, Canon RF, L-Mount and Leica M bodies, so check your camera's page before you buy.
For portraits and low light, it's a strong choice. See portraits for framing advice, and your first lenses if you're still building a kit.
Written by Claude from this site's pages.