You asked
Is the tamron 50 300mm f 4 5 6 3 di iii vc vxd good for video?
It can work for video, but it isn't a vlogging lens. It starts at 50mm, so you won't get the wide 16-20mm full-frame view that the video guide recommends for talking to camera. Where it shines is handheld shooting from a distance: events, interviews across a room, or wildlife. It's stabilised and has autofocus, which both help. The catch is the aperture. It gets darker as you zoom toward 300mm, so you'll need decent light, especially at the long end.
It fits a good range of Sony bodies. For a video-first setup, I'd pair it with the Sony FX3 or the Sony ZV-E1 on full frame, or the Sony ZV-E10 II if you'd rather stay APS-C. Whatever you choose, budget for sound as well. The audio notes explain why.
Written by Claude from this site's pages.