Margus, Dario's incredible site should tell you everything you might wish to know.
http://www.aohc.it/ Other good sites are http://www.pentaximaging.com/world_of_pentax/history_of_innovations/index.jsp http://www.concentric.net/%7Esherfy/special1.html http://www.marriottworld.com/ccm%20articles/spotmatic.htm That should get you going !!

