http://www.pentaxfans.net/thread-138657-1-1.html
(in Traditional Chinese, but posted pictures are self-explanatory.)
So, the hotshoe base material has been changed, from plastic to metal. The PCB inside/underneath has been updated too. It can be seen that the whole circuit board design has completely been revamped.
Speaking of those Metz flashguns for Pentax, last time they
