You asked
Is the sigma 24mm f 2 dg contemporary good for vlogging?
It's a usable vlogging lens, but I wouldn't call it an ideal one. On full frame it frames as 24mm, which is tighter than the 16-20mm equivalent I'd want for arm's-length shooting. On APS-C it becomes roughly 36mm, which is too narrow for most selfie-style shots. The stabilisation crop I usually warn about doesn't apply, since this lens isn't stabilised, but you'll still want more width.
If you do use it, pair it with a full-frame body like the Sony ZV-E1. The Sony ZV-E10 II is the easier vlog body, but this lens will feel tight on it. For the rest of the setup, see Video, and budget for a microphone too, because sound matters more than the lens.
Written by Claude from this site's pages.