"Pentax offers two different species of lenses for the Q system - mainstream and "toy" lenses. The Pentax 03 3.2mm f/5.6 Fisheye is the third mainstream lens if this classification can be applied to a Fisheye lens anyway. That said it shares a couple of aspects with the "toy" Q lens group

- it has a fixed max. aperture and doesn't offer AF. We reckon that the comparatively "fast" max. aperture lifted it into the mainstream class here. A focal length of just 3.2mm will sound odd for most readers but this relates, of course, to the small sensor size of the Q system. In full format terms it is equivalent to a 17.6mm fisheye lens which also explains the comparatively moderate field of view of "just" 160 degress (vs 180 degrees on most other fisheye lenses)."