Hi Rob, Outstanding URL & explanation! Makes the whole concept of a 'motor' inside a lens clear. I've done a bit of work with stepper motors, and inexplicably forgot there was such a thing. <g>
It all makes sense now. Thanks, keith whaley * * * * Rob Studdert wrote: > > On 12 Aug 2002 at 20:46, Tom Reese wrote: > > > "Rob Brigham" <[EMAIL PROTECTED]> wrote: > > Subject: RE: Interesting new Pentax US patent applications > > > > "Nope, the body could take any lens, the lens would tell the body whether > > to use its own motor or just send electrical signals..." > > > > Isn't it possible that Pentax could install an ultra-sonic motor in the body to > > speed up the focusing? > > Hi Tom, > > The ultrasonic motor's largest advantage is that it's physical construction > allows it to be mounted as a direct drive gear-less actuator inside the lens, > therefore mounting it inside a camera body would negate virtually all of its > advantages. > > See: http://www.photoscene.com/sw/tour/inside.htm > > Cheers, > > Rob Studdert - 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 .
