I think that my choice will be one of the following lenses (with rough prices in my country):
- ($420) Sigma 18-50mm F2.8 EX DC MACRO (HSM models are available to Nikon mount only);
- ($845) SMC Pentax DA* 16-50mm f/2.8 ED AL [IF] SDM;
- ($775) SMC Pentax DA 12-24mm f/4 ED AL [IF];
- ($400) SMC Pentax DA 16-45mm f/4 ED AL;
- ($600) SMC Pentax DA 17-70mm f/4 AL [IF] SDM.
If I understood correctly, SDM lenses give no advantage to AF speed except silent operation? On other side, I don't require superzooms at this time because I have 18-250 lens already. I think about indoor zoom lens. Therefore, one of the first 3-4 lenses will be optimal choice?
I think that Sigma 18-50 and Pentax 16-45 prices are attractive, especially the first one.