Can I use adapted lenses on the pentax k x?

Yes. The K-x uses the Pentax K mount, and old manual K lenses fit it directly. You don't need an adapter for them. The Pentax K mount page is the place to start if you want to see what's available.

For a sensible everyday kit on the K-x, I'd look at the Pentax smc DA 50mm f/1.8 for cheap, sharp portraits, or the Pentax smc DA 18-55mm f/3.5-5.6 AL WR if you want one lens for general use. The full list of lenses that fit the body is on the Pentax K-x page, along with the focal length equivalents, so you can check how each one frames on this 1.5x sensor.

Written by Claude from this site's pages.