On Feb 7, 2011, at 7:16 PM, Igor Roshchin wrote: > > > On 11-02-07 1:45 PM, Larry Colen wrote: >> On Feb 7, 2011, at 10:20 AM, Bruce Walker wrote: >> >>> On 11-02-07 1:12 PM, Larry Colen wrote: > >>> Have you tried AF-C? >> No I haven't. I probably should. >> >>> With moving objects I'd never try to use focus lock, myself. I'd just >>> turn off AF altogether. >> They aren't really moving that much, sometimes not at all. >> > > I almost always have it on AF-C while shooting people dancing, even > during the slowest dances. > > I also make sure that the shutter speed is sufficiently high, as even > with the flash, the motion blur can affect the sharpness. > (You can see that blur in this photo that I recently showed here: > http://www.komkon.org/~igor/PHOTOS/Mixed-2011/_IR25429.jpg ) > > Also, albeit very subjectively (i.e. without quantitative and systematic > tests), I found that 17-70/4 tends to produce somewhat sharper images of > the dancers than 16-50/2.8 even at f/4 or f/5.6. > The only way I can explain this is by different quality (or speed?) > of focusing. > I've been puzzled by that myself, and that why I chose to keep 17-70/4 > last year.
Sound like critical focus isn't properly adjusted for the 16-50. Have you tested and adjusted the focus point? > > Igor > > > -- > 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. -- 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.
