You asked
What is the leica summarit m 35mm f 2 4 asph good for?
The Leica Summarit-M 35mm f/2.4 ASPH is a simple, manual-focus prime for full-frame Leica M rangefinders. It's not stabilised, and it's from Leica's discontinued lower-priced Summarit line, so it's a modest, affordable way into a Leica M system. On a full-frame body, the 35mm view suits street and documentary work, and it's wide enough to include a little of the setting in environmental portraits. For portraits, a faster 35mm is the better choice.
It fits every Leica M body on this site, so you can pick by what else you want. For most people, the Leica M11 or the Leica M10 is a sensible everyday pairing. If you mainly shoot black-and-white, the Leica M Monochrom is worth a look.
Written by Claude from this site's pages.