You asked
What is the 7artisans m 28mm f 1 4 good for?
The 7Artisans M 28mm f/1.4 is a manual-focus prime for full frame, and it's made for the Leica M system. Its one job is a wide 28mm view, so it suits street work, where the street focal lengths guide explains that 28mm is immersive but means you have to get close to people. The f/1.4 maximum aperture also lets in plenty of light for dim scenes.
It's a lens for people who like to frame deliberately and focus by hand. It has no autofocus and no stabilisation, so it rewards patience rather than speed. It fits a long list of Leica M bodies, from the Leica M9 through to the Leica M11, so you can check your own body against the full catalogue page.
If you'd rather have a 35mm view, the street picks and the portrait lens guide cover other options.
Written by Claude from this site's pages.