Best portrait lens for the pentax k x?

For portraits on the K-x, I'd start with the lens and the light, not the body. The K-x's APS-C sensor gives a 1.5x crop, so a 50-85mm lens frames like a classic portrait focal length. Three good options from its catalogue:

• Pentax smc DA* 55mm f/1.4 SDM: fast and flattering, about 82mm equivalent. My pick for most people.
• Pentax HD D FA* 85mm f/1.4 ED SDM AW: the longer option, about 128mm equivalent, for tighter headshots and more background blur.
• Pentax smc DA 50mm f/1.8: the budget choice, about 75mm equivalent.

Whichever you pick, face a window and expose for the face. That will do more than any lens. See Portraits and Lenses for more.

Written by Claude from this site's pages.