On Feb 7, 2011, at 8:36 PM, Paul Stenquist wrote: > > On Feb 7, 2011, at 7:47 PM, Igor Roshchin wrote: > >> >> Mon Feb 7 18:22:50 CST 2011 >> Paul Stenquist wrote: >> >>> On Feb 7, 2011, at 7:16 PM, Igor Roshchin wrote: >>> >>>> 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? >>> >> >> No, I didn't, and I realize that. But I just didn't have time and energy >> to deal with that. >> (I didn't do any focus adjustments on any lenses mentioned here.) >> >> The first sample of 16-50/2.8 was showing worse results, so I just sent >> it back to the store. >> The second is much better if not good, as I don't seem to have >> obvious problems with photos of static objects (e.g. portraits of people >> sitting/staying, etc.). ... maybe not.. as photos taken with 50-135/2.8 >> in the same situation with the same subject appear noticeably sharper. > > Adjusting focus with the K20D is a virtual necessity. Most of my lenses > missed by quite a bit with that camera.
BTW, it only takes a couple of hours to fine tune a whole kit of lenses. > Paul >> >> 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. -- 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.
