Pentax developed the optics for DA* 50-135mm f/2.8 SDM and DA* 16-50mm f/2.8 SDM. The 12-24mm f/4 is a Tokina design. Can´t remember who designed the 10-17mm f/3.5-4.5 Fisheye.
The macro lenses 100/f2.8 and 35/f2.8 are Pentax designs but also rebadged by Tokina.
The macro lenses 100/f2.8 and 35/f2.8 are Pentax designs but also rebadged by Tokina.