You asked
What is the laowa 10mm f 2 8 zero d ff good for?
The Laowa 10mm f/2.8 Zero-D FF is a full-frame ultra-wide prime. It frames 10mm as marked on full frame, so it suits wide views where you want to fit a lot in. It autofocuses on Sony E and Nikon Z, but on Canon RF and L-Mount it's manual focus only.
Good matches from its fit list include the Sony a7 III, the Nikon Z6 II, and the Sony a6400 if you want a smaller APS-C body, where it behaves like a 15mm lens.
Keep an eye on close subjects. Very wide lenses exaggerate whatever is nearest the camera, as Portraits explains. For how f/2.8 behaves on different sensors, see the focal length converter.
Written by Claude from this site's pages.