Pentax K mount on Letus Extreme and EX1
 

I have access to some free Pentax K lenses in excellent condition and sharp. I wanted to know if anyone had any experience using the Pentax mount with the Letus Extreme and an EX1. The lenses are 24mm, 50mm, sigma 135mm. Being that Letus replaced both their older Nikon and Canon mounts, I wonder about the Pentax K mount.