You asked
Is the meike 85mm f 1 8 stm good on aps c?
It works on APS-C, but it's a long lens there. This is a full-frame lens, so on an APS-C body like the Sony a6400 or Fujifilm X-T30 it frames like 128mm. Its f/1.8 gives about the background blur of f/2.7 on full frame, so you still get soft backgrounds. You'll need room to step back, though, and it can feel cramped indoors.
If you shoot portraits on APS-C, I'd look at a shorter lens first. The Meike 55mm f/1.4 STM is made for APS-C and plays the same portrait role. For how the numbers work across sensor sizes, see the focal length converter. For more on lens choice, check the portraits guide.
Written by Claude from this site's pages.