Pentax Q has a Pentax Q lens mount and currently there are 8 native lenses available for this mount.
The latest released lenses that are compatible with the Q are the Pentax 08 Wide Zoom, the Pentax 07 Mount Shield Lens and the Pentax 06 Telephoto 15-45mm.
Q also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on the Q.
Since Pentax Q has a Small Sensor sensor, it has a focal length multiplier of 5.53× so you have to multiply lenses original focal length with this multiplier to find the Full Frame equivalent focal length of the lens when mounted on Q.
You may also also be interested in these:
Pentax Q Lenses with Image Stabilization
Pentax Q Lenses with Weather Sealings