You asked
What is the 7artisans 50mm f 1 4 tilt shift good for?
The 7Artisans 50mm f/1.4 Tilt-Shift is a manual-focus prime for APS-C cameras, and it also fits Micro Four Thirds. On APS-C it frames like a 75mm lens on full frame, and f/1.4 gives roughly the depth of field of f/2.1. That makes it a good fit for close portraits and details where you want the background to fall away.
It has no autofocus and no stabilisation, so it suits patient shooting. Good pairings include the Sony a6400, the Fujifilm X-T30 II, or the OM System OM-5. For why a fast 50mm-class lens earns its place, see portraits.
This lens page doesn't explain what the tilt-shift movement does to your pictures, so look that up before buying if it's the main reason you're interested.
Written by Claude from this site's pages.