Ulta Sonic Motor. Its where the AF motor is in the lens, and the body uses electrical contacts to control it. It is usually much quieter and faster than having the motor in the body and gears etc through to the lens.
> -----Original Message----- > From: Keith Whaley [mailto:[EMAIL PROTECTED]] > Sent: 12 August 2002 12:13 > To: [EMAIL PROTECTED] > Subject: Re: Interesting new Pentax US patent applications > > > Please reveal what USM is to this old newby! <g> > > keith whaley > > Scott Nelson wrote: > > > > > You'd think that since they have a new 'flagship', the > MZ-S, another > > > one is not in the works or is not coming any time soon. > > > Maybe the MZ-S already supports a USM focussing interface > using the PZ > > contacts, but Pentax just hasn't told us yet. We all know how good > > Pentax is at keeping secrets. As for the 118/2.5, that sure sounds > > like a new limited lens. > > > > -Scott > - > This message is from the Pentax-Discuss Mail List. To > unsubscribe, go to http://www.pdml.net and follow the > directions. Don't forget to visit the Pentax Users' Gallery > at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
