Originally posted by Amoon I know K-3II flash syncs at maximum 1/180 but is there a way to make it fire the flash with speeds beyond 1/180 and without having a HSS capable speedlight? I have a speedlight with stroboscopic capabilities (up to 90 number of flashes per second) that I believe can do the HSS trick IF Pentax let me activate the speedlight. !
Sadly, for your own protection -- assuming you're a complete idiot, Pentax cripples the cameras and refuses to allow flash with shutter speed over the sync speed (1/180 for most models, 1/200 for the K1).
At 90 flashes per second, you might catch one flash during the 1/180s shutter speed. It is likely you would catch no flash.
The flash duration is also important. If it is too short (and the camera could actually catch multiple flashes), you might only get thin bands of light at each pulse.
You either need a very long flash duration (no shorter than your sync speed) -- which some brands use to make an HSS compatible flash.
Or true HSS style pulsing that will generate multiple flashes where each pulse is sent before the brightness fades too much from the prior one.
Cactus V6-II transceiver works well with the RF60 for true HSS without the need for an additional PTTL HSS compliant flash. You do need to update the firmware to Pentax specific code, but if you are not swapping between camera models, it works well. I think you can get a couple heads and the transceiver for less than a Pentax flash.