Originally posted by iancx Anyone here tired to use the Cactus V6 2 with 645z does it work in pttl?
I haven't tried it but Cactus posted on their community forum that the V6II is compatible with the 645Z.
As mcgregni pointed out, however, you'll only get HSS from a V6II, not any of the other P-TTL features. In particular, there is no automatic flash exposure control. All settings are made manually.
Originally posted by iancx Can the Cactus be connected directly to a studio storbe an trigger?
Yes, with a sync cable from a V6II receiver to the strobe.
If you don't want HSS then you might as well use a V6 which is a bit cheaper.
If you want HSS then your strobes need to support a manual switch into HSS mode (some Godox strobes do that, for instance) or your strobe's pulse must be at least around 1/125s long. The PCB Einstein model, for instance, always produces faster pulses, even in its slower "color" mode, and is hence not suitable. More traditional strobes (non-IGBT-based) should have a better chance of working, in particular at lower output levels.
If you want full P-TTL then you are out of luck. There are no studio strobes that support P-TTL.