You asked
What is the ttartisan apo m 35mm f 2 asph good for?
The TTArtisan APO-M 35mm f/2 ASPH is a manual-focus prime for full frame, and it's built for Leica M bodies. It gives you a fixed 35mm view and an f/2 maximum aperture, so it's a sensible pick for street, environmental portraits and everyday documentary work where you want a little background softness and a view that shows where someone is. There's no autofocus and no stabilisation, so it suits people who are happy to focus by hand.
It fits a long run of Leica M cameras, from the Leica M9 through to the Leica M11, so you can use it across most of the M range. If you want a feel for what a 35mm f/2 or f/1.4 lens does for people and groups, the portraits page explains why 35mm works well for environmental shots. For a broader choice of lenses, the lenses page is a good place to start.
Written by Claude from this site's pages.