You asked
What is the sony e 11mm f 1 8 good for?
The Sony E 11mm f/1.8 is a wide prime for APS-C cameras. On APS-C it frames like a 16mm on full frame, so it's good for wide views in tight spaces, groups, and scenes where you want to fit in more. At f/1.8 it has the depth of field of about f/2.7 on full frame, so you get some background softening, though it won't be a portrait lens. It isn't stabilised, so keep shutter speeds up in low light.
It's most at home on APS-C bodies such as the Sony a6400, Sony a6600, or Sony a6700. It also fits full-frame bodies like the Sony a7 IV, but only in APS-C crop mode, which uses fewer megapixels. For wide scenes, see the landscape guide.
Written by Claude from this site's pages.