Cactus RF60 Flash

thanks again

I just bought a Cactus RF60 flash and a V6 transceiver, downloaded the instruction booklets, and though it works in 'normal' flash modes, it does not work in High Speed Sync mode. I've looked in the booklet many times, looked online for information, and I cannot find any workaround for this problem. Nikons don't have this problem, and as far as I know, Canons don't either, but Pentax certainly does.

The Pentax flash system is not particularly well supported by 3rd party brands.
HSS requires Pentax TTL from memory. Nigel will advise

Not entirely sure what you mean by "High Speed Sync mode", I guess you mean shutter speeds beyond 1/180s.
Pentax disables the regular trigger signal to the hot-shoe when the shutter speed is above 1/180 and the Cactus V6 does not pretend to be an HSS-capable flash (end hence does not prevent the disabling of the trigger signal). However, there are workarounds for the V6 (see the links below).

Check out the answers I provided in one of the other posts you made about this subject

Nikons and Canons don't support HSS with a non-system specific trigger like the V6 either. They require special system-dedicated triggers in order to support HSS via radio.

Cactus posted a while ago that they are working on a successor for the V6 that will pretend to be a system-specific flash and hence support HSS natively. Until then, perhaps you can use the workarounds.

That is only true for "HSS the triggering approach" (i.e., pre-sync timing).

Regarding "HSS the lighting approach", one can use RF60s in "HSS sympathy" mode to create the same light bursts that approach continuous light that you get from system-specific HSS-capable flashes. See my post above for a link to the two approaches to make use of that capability.

Thanks for the above info Class A

No worries.