You asked
Is the samyang af 14mm f 2 8 good for video?
The Samyang AF 14mm f/2.8 can work well for video, with one caveat. It's an autofocus lens, but it has no stabilisation, so you'll want a camera with good in-body stabilisation or a gimbal for handheld shots. Its wide view suits vlogging, and on APS-C it frames like about 21mm, which sits right in the vlogging sweet spot. On a Sony APS-C body, that makes the Sony ZV-E10 II or Sony ZV-E10 a sensible pairing. For full frame, the Sony ZV-E1 is the one built with video in mind. Don't skimp on sound either: a microphone will do more for your footage than the lens will.
Written by Claude from this site's pages.