You asked
What is the leica elmar m 24mm f 3 8 asph good for?
The Leica Elmar-M 24mm f/3.8 ASPH is a small, slow wide-angle prime for full-frame Leica M cameras. It's manual focus, not stabilised, and one of the cheaper Leica wides on the used market. I'd treat it as a lens to carry everywhere rather than one for low light.
Its 24mm view suits landscapes, big skies and architecture, the same job the landscape guide gives to wide zooms. At f/3.8 it isn't fast, so stop down to f/8 or f/11 for depth of field, which is how most landscape work is shot anyway.
Good bodies to pair it with include the Leica M11, the Leica M10-D and the Leica M (Typ 240). For what else to add to your kit, see the lenses guide.
Written by Claude from this site's pages.