On Tue, Feb 17, 2009 at 5:23 PM, Carlos Royo <[email protected]> wrote: > > > Carlos Royo escribió: >> >> The only drawbacks of the 18-50 EX macro are, besides >> not being a Pentax lens, distortion at 18 mm. (but all the lenses in the >> same category show more or less the same distortion), and the absence of >> SDM. > > I meant to say "absence of QSF", not "absence of SDM". The lens uses > screwdriven AF, but I don't see that as a disadvantage. Damned acronyms. > > Carlos >
Same difference in Sigma's case, you only get manual focus override with HSM. Only Pentax makes the clutched QSF-capable screwdriver lenses. -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- 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.
