On Thu, 16 Aug 2007 07:21:02 -0400, Adam Maas wrote: Adam/ David
I am very well aware of the info contained on those pages on Boz's site. However. have either of you looked at an MZ60? It cannot be used with A series lenses at all. So it stands to reason that pentax would remove anything that is used for A series Lenses. Indeed they have, the apature feed back leaver but only contacts A1 and A2. R1, R2 and R3 are still present along with the * contact. So it stands to reason that the R contacts are used for lens serial comnunication of some form. As i said earlier, A broken sigma lens and a logic probe says that there is some form of comnunication happening. I have told Boz but without some facts/ logic traces to back it up, I cannot prove it. Also the lens info contacts can be made to do both input and ourput. James >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. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
