I have long wondered how Pentax auto/TTL flash units are able to set the aperture on "A" series and later cameras and lenses. I find this especially intriguing since the Pentax Auto flashes (eg. AF400T, AF280T, AF200T, etc) came out at about the same time as the LX (1980) - 3 years before A lenses and the SuperA/Super Program camera were released. As we all know, the LX does not support A-lenses - so - is it possible that in 1980 Pentax knew that A-lenses and cameras would be released later and designed the flash units to be compatible with them? Furthermore, if this is the case, why did they not design the LX as the first "A" series camera body?
