On Thu, 16 Aug 2007 18:50:46 +1000, 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
Hi James, very interesting. I can handle the lack of AF, I'm generally using the combo for wildlife and speed is not that critcal at the distances it will be used. Do you know if the lens will still transmit aperture value or would I be left with AV and DoF preview as with a K mount lens? Regards, John ---------------------------------------------------------------------------------------------------- The information transmitted is intended only for the person to whom it is addressed and may contain confidential and/or privileged material. If you have received an email in error please notify Carmel College on [EMAIL PROTECTED] then delete all copies of it from your systems. Although Carmel College scans incoming and outgoing emails and email attachments for viruses we cannot guarantee a communication to be free of all viruses nor accept any responsibility for viruses. Although Carmel College monitors incoming and outgoing emails for inappropriate content, the college cannot be held responsible for the views or expressions of the author. The views expressed may not necessarily be those of Carmel College and Carmel College cannot be held responsible for any loss or injury resulting from the contents of a message. ---------------------------------------------------------------------------------------------------- -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
