You asked
Sony e 50mm f 1 8 oss vs ttartisan af 56mm f 1 8?
Both are f/1.8 autofocus primes for APS-C, but they differ in a few ways that matter.
The Sony E 50mm f/1.8 OSS has optical stabilisation and only fits Sony E mounts. It frames like a 75mm on full frame, which suits people and everyday shooting.
The TTArtisan AF 56mm f/1.8 has no stabilisation, but it fits Sony E, Fujifilm X and Nikon Z. It frames like an 84mm, a little tighter, which is closer to the portrait look described on portraits.
If you shoot Sony and want steadier handheld shots in dim light, I'd take the Sony. If you shoot Fujifilm or Nikon Z, the TTArtisan is the obvious choice. For a first fast prime, see lenses.
Written by Claude from this site's pages.