Originally posted by emsee 1) If I use Cactus V6II on camera and mount Cactus RF60x on top of V6II on camera, can I get P-TTL and HSS (on-camera)?
I'm not as quick as mcgregni in ruling out that this scenario won't work.
The trick would be to still run the RF60X as if it were off-camera, i.e., communicate with it via radio instead of through the hot-shoe. There are two potential complications:
- the RF60X could be too close to the V6II in order for the radio signal to be transmitted. However, I just tried this configuration and could still control the RF60X from the V6II via radio.
- the RF60X would receive trigger signals via radio and through the hot-shoe. The hot-shoe trigger signals may interfere but if that's the case (haven't tried it) then you should be able to slide a piece of paper between the V6II's hot-shoe and the RF60X centre contact to prevent any hot-shoe induced triggering.
Alternatively, you just follow khardur's suggestion and use a flash bracket. I find that this results in a better balance of the whole camera/flash configuration.
Originally posted by emsee 2) If I use a Canon compatible flash (Godox), how does the X-TTL work? Does it work on-camera (mounted on top of V60II)?
It doesn't in combination with Pentax. The idea about X-TTL is to achieve cross-brand TTL but Cactus weren't able to realise that cross-brand aspect with Pentax. So the Pentax X-TTL variant requires all involved devices to be P-TTL compatible. Flashes can still be from various brands, but they must implement Pentax's P-TTL protocol.