This is a little tricky, as Pentax has had two different mirrorless cameras, the Q series and the K-01, and these use different mounts. The K-01 uses a standard K (DSLR) mount, and there are plenty of lenses available for that mount, as well as one mirrorless lens.
Q mount lenses that were produced:
- Pentax Q 5-15mm f/2.8-4.5 Lens Specifications
- Pentax Q 3.8-5.9 f/3.7-4 Lens Specifications
- Pentax Q 15-45mm f/2.8 Lens Specifications
- Pentax Q 3.2mm f/5.6 fisheye Lens Specifications
- Pentax Q 6.3mm f/7.1 Toy Wide Angle Lens Specifications
- Pentax Q 8.5mm f/1.9 Lens Specifications
- Pentax Q 11.5mm f/9 Body Cap Lens Specifications
- Pentax Q 18mm f/8 Toy Telephoto Lens Specifications