Originally posted by awaldram Are you saying the Cactus V6 support non-centre pin flash triggering
i.e Digital signal control ?
The Cactus V6 use a digital protocol (i-TTL, ETTL, P-TTL) for some flash models.
See how the power level on the YN568EX changes while Brian Hursey is turning the dial on the Cactus V6?
This is only possible because the Cactus V6 communicates with the YN568EX digitally. It does the same trick with a number of other flashes.
However, the Cactus V6 is also capable of using the old analogue TTL (quench-based) method of power level control. Therefore it is able to support a lot more older flashes.