---- John Sessoms <[email protected]> wrote: > From: Sam L > > On Tue, Apr 6, 2010 at 6:16 AM, Carlos R <[email protected]> wrote: > >> > Larry Colen escribi?: > >>> >> > >>> >> I don't know this lens, but it's probably at least as good as the kit > >>> >> lens, and a lot faster: > >>> >> > >>> >> Apr 4 - Sigma 18-50mm f/2.8 EX DC Macro Lens for Pentax - $325 - > >>> >> (oakland > >>> >> rockridge / claremont) pic photo/video > >> > > >> > It is MUCH better than the kit lens. I've had one for more than two > >> > years, > >> > and it is one of my most used lenses. The only advantages of the kit lens > >> > over this Sigma EX are: QSF and (if you care about it) that the Sigma > >> > lens > >> > blocks the RTF under 24 mm. > > > > > > What is QSF? (quality of service fund???) > > What is RTF? > > I think QSF is Quick Shift Focus - ??? - a way of changing from auto to > manual focus and back. > > For RTF, I'm stuck with WTF?
QSF is indeed the system for manually touching up focus when in AF. RTF (I can never remember the exact meaning) is the pentaprism pop-up flash. -- 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.
