On Thu, 12 Sep 2002 16:23:04 +1000, Anthony Farr wrote: > >Whoa! You're counting your chickens before they hatch. From the qoute >you've supplied it seems like Pentax have found a means to multiplex the >data streams of 3 in-lens-devices (eg. power zoom motor, focussing motor and >IS system) through one connection which is presumably the power-zoom >contacts that we already know about from the Z/PZ series.
I really don't think so! These contacts only supply POWER to the lens (power-zoom) and that power could be used by any 'device' in the lens that needs it. (Which is why these contact are so large and rigid) The intelligence needed to CONTROL the devices is thrue one of the other smaller pins in the lens mount. One of those is a serial (digital) interface that can carry information about anything the lens and body agree upon. > Apparently (my >guess, that is) there is some method of inhibiting a device from acting in >response to received data if that data was intended for a different kind of >device. This doesn't imply that more PZ lenses are in the offing, only that >a means has been found to prevent your current PZ lens from inappropriately >zooming when it receives a signal intended for the focussing device or IS >device of an as yet unreleased lens. IS and USM can use the same power-source, and I don't see a reason why anymore pins would be needed to exchange information. They just need to expand the protocol on that serial connection, and if the engineers at pentax deserve that name, they will have designed it to be expandable. Regards, JvW (Electronics Engineer and programmer :-) ------------------------------------------------------------------ Jan van Wijk; http://www.dfsee.com/gallery
