You asked
Best camera for the pentax smc da 50 135mm f 2 8 ed if sdm?
For portraits and tight telephoto work, my everyday pick is the Pentax K-3 Mark III. It's an APS-C body, so the 50-135mm frames like 75-202mm, which is a comfortable portrait reach. If you want something smaller, the Pentax KP pairs well with it. The Pentax K-1 Mark II is the full-frame option, using the lens in APS-C crop mode at fewer megapixels.
The lens isn't stabilised, so keep your shutter speed up when shooting handheld. For more on why a longer lens suits faces, see the lenses for portraits.
Written by Claude from this site's pages.