You asked
Is the canon rf 15 30mm f 4 5 6 3 is stm good for vlogging?
Yes, on a full frame body. The Canon RF 15-30mm f/4.5-6.3 IS STM starts at 15mm, and our video guide suggests about 16-20mm full-frame equivalent at arm's length, so this lens covers that range. It's stabilised, which helps when you're holding the camera.
The catch is the aperture: it's f/4.5-6.3, so it gets darker as you zoom in. On an APS-C body it frames like 24-48mm, which is too tight for arm's-length shots. If you're shooting APS-C, I'd look at the Canon RF-S 14-30mm f/4-6.3 IS STM PZ instead, a power-zoom lens made for vlogging.
Full frame bodies it fits include the Canon EOS R6 Mark II and the Canon EOS RP. Whichever you pick, budget for sound too; see audio.
Written by Claude from this site's pages.