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
