You asked

What is the ttartisan 7 5mm f 2 fisheye good for?

The TTArtisan 7.5mm f/2 Fisheye is a manual-focus prime made for APS-C cameras. On those bodies it frames roughly like an 11mm lens on full frame, and f/2 gives about the depth of field of f/3. It's best if you want a very wide, dramatic view and don't mind focusing by hand. It isn't stabilised, so keep your shutter speed up when shooting handheld.

Very wide lenses exaggerate whatever sits closest to the camera, so I'd skip it for portraits. It fits a long list of Sony E, Fujifilm X, Nikon Z, Canon RF, L-Mount and Micro Four Thirds bodies, so check your camera's page before you buy.

Written by Claude from this site's pages.

From these pages