Is the pentax smc da 50 135mm f 2 8 ed if sdm good for portraits?

Yes, for portraits it's a good choice. On APS-C it frames like 75-202mm on full frame, and f/2.8 gives a soft background at a comfortable distance. That's the kind of tight headshot lens my portraits guide recommends, since standing back keeps faces in proportion.

It isn't stabilised, so keep your shutter speed up when you shoot handheld. It fits a long list of Pentax K bodies. For portraits I'd pair it with the Pentax K-3 Mark III or the Pentax KP. If you want full frame, the Pentax K-1 Mark II can use it in APS-C crop mode, at fewer megapixels.

Full details are on the lens page.

Written by Claude from this site's pages.