Thanks for all of the feedback guys. Yep, I know that the AOV is quite varied in this grouping - I am more interested really in the widest end, and the speed (and of course overall image quality etc). I'm really thinking that at f4 the 12-24 is just that bit too slow. I know that it is a lovely lens and I considered it a while back but f4, with moving babies and darkish interiors. Of course, when I get my hands on my new K-5, it won't be such an issue...
I do know also that the 16-50, isn't too much different from the 18-55 kit lens that I currently have, but you know I NEVER use it unless it is for an interior or a funky looking fashion shot and it is almost ALMOST used at 18mm. I'd love something a little wider, but not to the point of being fish eye, which is why I included the 16-50. I don't EVER use zooms anymore unless I really have to. I shoot almost exclusively these days with my FA50mm 1.7 or my FA100m f2.8 macro and very occasionally with the 18-55mm or I also have a 28-70mm/f2.8 Tokina that is getting on now but is a huge, heavy lens and gives fine results and used to be my main lens in my wedding photography days... Anyways, I think I pretty much have it narrowed down to either the: 2. PENTAX-DA* 16-50mm f/2.8 ED AL[IF]SDM - about $1400 Or 4. Sigma Lens 10-20mm f/3.5 EX DC HSM - about $927 I just think that the 12-24mm is just that bit too slow. Interested to hear any further thoughts? -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.

