Originally posted by Class A Some radio triggers don't want to sync faster than 1/30 with Pentax flashes. The problem in this case was the relatively low trigger voltage of Pentax flashes. The voltage drop needed to be higher to allow faster syncing. The solution in this case was to modify the trigger (extra cable I think from the triggering diode to the battery ground).
Yours might be a similar problem. Have you tried different flashes?
This is seen with all flashes, even the Elinchrom strobes to which the trigger is connected. It is either a synch delay in the product, or some sort of timing issue in the Pentax hotshoe.
Yet... if I stick a 'dumb flash' in the host shoe and slave off that, there is no unwanted delay. The delay is only present with the Skyports, so I am rather confident that the device is to blame... but I do not have an oscilloscope or other sufficient equipment to prove that completely.