Originally posted by clackers Like all the Pentax DSLRs, the 645Z should do HSS automatically if you attach any HSS capable flash or controller.
You are correct, alas it does not work for many controllers that support HSS. I have tried with a number of brands of controllers including Pocket Wizard and Odin along with the Indra 500 and Rovelight 600 which supports high speed flash without success including Manual Mode
The 645z recognizes the controller as a flash unit and automatically sets the speed to 1/125th regardless of the shutter speed set in manual mode. The only solution I am aware of is Priolite which is too expensive for me.