Note that SDM lenses are micro-motor drive, which is necessary to build dual-drive lenses. The really fast USM/AF-S lenses use a ring-type motor that is noticably faster than micro-motor designs. The Nikkor 18-70 AF-S uses such a ring-type motor.
-Adam On 1/27/08, Jaume Lahuerta <[EMAIL PROTECTED]> wrote: > I am afraid that even Pentax acknowledges that there is no improvement in > focus speed with the SDM lenses. They are just quieter. > Note that their product description doesn't even talk about speed: "advanced > SDM system that ensures smooth, quiet autofocusing operation using the > supersonic motor installed in the lens body" > > Regards, > Jaume > > ----- Mensaje original ---- > > De: Brendan MacRae <[EMAIL PROTECTED]> > > Para: Pentax-Discuss Mail List <pdml@pdml.net> > > Enviado: lunes, 28 de enero, 2008 0:24:40 > > Asunto: Re: k10d vs nikon d80 handling > > > > Gaurav, > > > > Were you using a K10D with the new SDM lenses? They > > focus pretty quickly and are very quiet because the > > focus motor is in the lens. Other DA lenses will focus > > a bit more slowly and be louder. > > > > My buddy shoots Canon and says that his 40D (with 9 > > autofocus sensors to the K10D's 11) focuses very > > quickly. But this camera also does 6.5 fps and is $500 > > more for the same MP's. > > > > > > > > -Brendan > > > > --- Gaurav Aggarwal wrote: > > > > > Hi, > > > > > > I am hoping to buy my first Digital SLR and spent a > > > few minutes in a > > > store before my wife dragged me out :-) I use a > > > Pentax ZX-M with two > > > PKA zoom lenses right now (35-105 f/3.5 and 70-200 > > > f/4). > > > > > > I thought that I liked the feel of Pentax K10D but > > > then when I tried > > > Nikon D80 it sort of felt lot better. Was this > > > because I spent too > > > little time inside the store and not outside etc.? I > > > don't know. The > > > focussing on Pentax with the 18-55 seemed to hunt > > > compared to the > > > Nikon that had 18-70. > > > > > > Has anyone had direct exposure to Canon and Nikon > > > besides Pentax. I > > > searched the archive and read a few emails on this > > > topic but wanted to > > > ask all over again. Sorry about this. My concern is > > > that Pentax > > > autofocus may seem to hunt more and be less > > > accurate. The salesman and > > > couple of other customers in the store all suggested > > > that Nikon is way > > > better than Pentax. > > > > > > Gaurav > > > > > > -- > > > PDML Pentax-Discuss Mail List > > > PDML@pdml.net > > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > > to UNSUBSCRIBE from the PDML, please visit the link > > > directly above and follow the directions. > > > > > > > > > > > > > > > > ________________________________________________________________________________ > > ____ > > Never miss a thing. Make Yahoo your home page. > > http://www.yahoo.com/r/hs > > > > -- > > PDML Pentax-Discuss Mail List > > PDML@pdml.net > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > to UNSUBSCRIBE from the PDML, please visit the link directly above > > and > > > follow the directions. > > > > > > > > ______________________________________________ > ¿Con Mascota por primera vez? Sé un mejor Amigo. Entra en Yahoo! Respuestas > http://es.answers.yahoo.com/info/welcome > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
