Originally posted by Tomzee93
I'm not quite sure, but I believe the K-x will only trigger an external flash at shutter speed 1/180.
... or slower. All Pentax dslrs will synch at any speed less than or equal to 1/180 second.
Are you using any kind or radio or optical triggers, or are all the flashes connected with wires? There have been reports that some (especially the less expensive) radio slave triggers are very intermittent at the max. shutter speed of 1/180. Some users have reported having to slow down to 1/125 or so.
If you're connected via wires, it should be more reliable.
One thing, though. If using wires, I would check the trigger voltage when all those flashes are wired together. Some flashes can present very high voltage across the hotshoe, of 300 volts or more. This is dangerous for the electronic synchronization circuits in the camera. I don't think Pentax has ever stated a maximum voltage, but the concensus seems to be 25 volts or less, and the lower the better.