Is my flash compatible with Cactus V5?
To check whether your dedicated flash units are compatible with Cactus V5, try attaching them to a camera of other brand in manual mode (e.g. attaching a Nikon TTL flash to a Canon DSLR camera). If the flash can be triggered, it will work with Cactus V5.
Hi, will the v5 trigger work with Yongnuo yn-560 III flash?
The YN560-III can be triggered by the V5 like almost any other manual flash, if you put it on a V5 receiver.
A V5 transmitter cannot make use of the YN560-III's built-in trigger directly, if that is your question. You'd need to use one of the compatible Yongnuo triggers (not all of them are) for that.
Yes as Class A said the YN560-III works on the V5 as it is a manual flash.
FYI, many other TTL flash would work too but you just have to switch the mode to M (manual) - only using centre hot shoe pin for flash triggering.