You asked
Is the sigma 28 45mm f 1 8 dg dn art good for video?
The Sigma 28-45mm f/1.8 can work for video, but it isn't a vlogging lens. Its f/1.8 aperture is bright, so it handles dim rooms well and gives a soft background. It isn't stabilised, though, and its 28-45mm range on full frame is narrower than the 16-20mm I like for holding a camera at arm's length. If you shoot at a desk or on a tripod, it's a good choice.
For handheld video, I'd look at Sony FX3 or Sony ZV-E10 II, both on that lens's compatibility list. Whatever you pick, budget for sound too. Bad audio ruins more videos than soft focus does. See Video for the full checklist and audio for microphone options.
Written by Claude from this site's pages.