You asked
What are the alternatives to the sony e 50mm f 1 8 oss?
If you want a different focal length in the same spirit, the closest alternative I have a page for is the Sony E 35mm f/1.8 OSS. It's another fast APS-C prime, just wider, so it suits environmental portraits and groups better.
For a tighter view, my portrait guide covers the options. An 85mm f/1.8 is the classic full-frame portrait lens, and on APS-C a 56mm f/1.2 to f/1.4 plays the same role. See the lenses for portraits.
I don't have a full list of other 50mm-class lenses for Sony E, so I can't name more alternatives with confidence. The primes or zooms section explains when a prime is worth it over a zoom.
Written by Claude from this site's pages.