Mount: Pentax KAF2, APS-C
Build quality: very good for a plastic lens
Filter thread: 77mm
Infrared Mark: no
"Turn zoom", front element does not turn when zooming or focussing.
This is a reduced-frame (APS-C) superwide zoom. Rumour has it that this is the Pentax version of Tokina's 12-24. Anyway, it's a great lens!
More shots with this lens in my Gallery: Pentax_DA_12-24.html