Is the yongnuo yn16mm f 1 8s da dsm worth it?

Yes, if you shoot Sony E and want a fast, compact wide prime. On APS-C it frames like a 24mm on full frame, and f/1.8 gives depth of field close to f/2.7. That's a sensible everyday view for streets, travel and interiors.

It suits APS-C bodies best, such as the Sony a6400, Sony a6600 or Sony a6700. On a full-frame body like the Sony a7 III it only works in APS-C crop mode, at fewer megapixels, so I'd skip it there.

If you want a more standard view first, the Lenses page suggests a fast prime around 33-35mm on APS-C.

Written by Claude from this site's pages.