Can I use adapted lenses on the pentax k s1?

Here is what the site says about that.

From Pentax K-S1: Pentax K-S1: A DSLR by Pentax with a 20.1-megapixel APS-C sensor, announced in 2014. Specs - Maker: Pentax - Mount: Pentax K - Sensor: APS-C, 23.5 x 15.6mm, crop factor 1.5 - Resolution: 20.1 megapixels - Stabilisation: in the body - Announced: 2014 - Type: DSLR Focal lengths on it Lenses frame like 1.5 times their focal length on full frame: 16mm like 24mm, 23mm like 35mm, 33mm like 50mm, 57mm like ...

From Landscape: Landscape: Landscape photography is slow. The light does the work, the scene doesn't move much, and you can use a tripod. That changes what matters in a camera.

Quoted from this site's pages.