You asked
Is the viltrox af 9mm f 2 8 air good for vlogging?
Yes, with one caveat. On APS-C this lens frames like 14mm on full frame, a little wider than the 16-20mm equivalent I suggest in my vlogging guide. That's still comfortable at arm's length, though you'll take in more background than you might want. The bigger issue is that it isn't stabilised, and you'll be holding the camera for minutes at a time, so a stabilised body or a gimbal will help a lot.
For a vlogging setup, I'd look at the Sony ZV-E10 II, the Sony a6700 or the Nikon Z30. All three take this lens. Whichever you choose, budget for a microphone too. Bad audio ruins more videos than soft focus does.
Written by Claude from this site's pages.