It's those little bumps on the lens mount that make the electrical contact for reading info from the lens. Turn the aperture from f22 to 'A' and watch the last bump in the series move up 1 mm - contact! If you don't have 'A' set, you don't need the chip's mtf info. Regards, Bob S.
On 12/4/06, Stan Halpin <[EMAIL PROTECTED]> wrote: > F series and later "transmit" MTF and other info to the body. The > assumption is that the transmission requires power of some sort. > > stan > > On Dec 5, 2006, at 12:07 AM, John Celio wrote: > > >> Anyone got any theories on how F and later series lenses are powered? > > > > What are you talking about? The only lenses I can think of that would > > need > > any power are the Power Zoom and (future) supersonic focusing lenses, > > both > > of which have those two special contacts just inside the lens mount for > > providing power from the camera body. Otherwise, all other lenses are > > driven by the camera's AF motor. Is there something else that would > > need > > power? > > > > John > > > > -- > > http://www.neovenator.com > > http://www.cafepress.com/neovenatorphoto > > > > > > > > -- > > PDML Pentax-Discuss Mail List > > [email protected] > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
