Hello Bruce Adaptall 2 is simply the latest version of the mount. KA contacts were only introduced on AD2 mounts, it is true to say. AD1 mount does not work with AD2 lens, however AD2 mount works with either type (the lenses being more durable than the mount).
Kind regards Peter - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
