Bob, Do you mean that the camera doesn't recognise the lens if the aperture ring is set to other than A?
Jostein (currently a couple of km away from my camera) On 12/5/06, Bob Sullivan <[EMAIL PROTECTED]> wrote: > 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 > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
