These are the pages Adam is refering to: KAF mount <http://www.bdimitrov.de/kmp/technology/K-mount/Kaf.html>
KAF2 mount <http://www.bdimitrov.de/kmp/technology/K-mount/Kaf2.html> Cheers, Dave On 8/16/07, Adam Maas <[EMAIL PROTECTED]> wrote: > Jim, look at Boz's site. The Pentax contact layout uses 6 pins as a > coded max/min aperture info(6 bit digital code, 3 bits for max aperture, > 3 bits for minumum), one to indicate whether or not the lens set to A > and one as a signal line. The latter only exists on F or later mount > lenses and KAF and later mount bodies and is the only contact involved > in any communication between the lens chip and the body (the mount > itself is ground). The two pins inside the mount on KAF2 bodies are > power for Power Zoom and SDM lenses. > > -Adam > > > jim wrote: > > On Wed, 15 Aug 2007 09:36:01 -0500, Charles Robinson wrote: > > > > Not a pin as such no. Camera comnunication with lens is some form of serial > > protocol. > > The DIGITAL pin I believe is power for the lens chip. The r3, r2 and r1 > > contacts are for the serial bus of some form. > > A1 and A2 aren't used tho these new SDM lenses may use these pins as well > > (focus?) > > Info passed would be lens type number, focal length, zoom position , MTF > > and what ever else pentax has decided to add. > > Covering one digital pin will kill all the above info transfer so chances > > are lens won't auto focus either. > > > > I cannot prove any of the above unless some one has a multi input logic > > analyser and data logger. > > Got all of this from pulling apart a sigma lens, using a logic probe and > > some guess work. > > > > james > > > > > >> Isn't there a pin/contact/whatever somewhere on the teleconverter > >> that you could cover with tape so that it did NOT pass focal-length > >> information? > > > > > > > > > > > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
