Is the viltrox af 9mm f 2 8 air worth it?

Yes, if you shoot APS-C and want something wide. On an APS-C body it frames roughly like 14mm on full frame, and it has autofocus, which makes it much easier to live with than a manual ultra-wide. The f/2.8 aperture gives about the depth of field of f/4.2 there, which is handy for keeping more of a scene sharp.

It isn't stabilised, so you'll need a steady hand or a fast enough shutter speed. It also fits many full-frame bodies, but only in APS-C crop mode, which uses fewer megapixels. It's really an APS-C lens.

If you shoot a Fujifilm X-T5 or a Nikon Z50, it's a small, sensible wide. For the bigger picture on sensor size, see Sensor sizes.

Written by Claude from this site's pages.