You asked
What is the 7artisans 10mm f 3 5 good for?
The 7Artisans 10mm f/3.5 is a manual-focus, wide-angle prime for APS-C cameras. On Sony E, Fujifilm X or Nikon Z it frames like a 15mm lens on full frame, and on Micro Four Thirds like a 20mm. That's wide enough for landscapes, interiors and architecture, and f/3.5 keeps a fair amount in focus, roughly f/5.2 worth on APS-C.
It suits zone focusing, which makes it handy for street photography. With no autofocus and no stabilisation, it rewards slow, deliberate shooting. It fits a long list of bodies, including the Fujifilm X-T5, the Sony a6400 and the OM System OM-5. To check the framing on your own body, the focal length converter does the maths.
Written by Claude from this site's pages.