Originally posted by mojoe_24 Would a Cactus V6II work with the YN585EX or would I need wireless triggers for that too? Just ask because the 585s seem pretty cheap on eBay. THe Cactus isn't that expensive so I may go that route, but it seems like I'd also need to get more expensive flashes for that.
I think some confusion ensued here regarding Yongnuo flashes.
The Yongnuo 560 III flash has a built in radio receiver and the Yongnuo 560 I/V has both a radio transmitter and receiver built in. So paired with just the 560 TX trigger or which ever other trigger from Yongnuo (I think the 602 works as well) they will work without the need for an additional radio receiver since it's already built into the flash(es).
The Pentax dedicated Yongnuo 585 EX does not have a built in radio receiver so it will only work optically as a slave but if I recall correctly it does work with the Pentax optical P-TTL off camera wireless mode. The flash does not support HSS though, either on camera or off.
I have the Shanny SN600FGZ and have used it without issue on camera in HSS and with Cactus V6II transceivers at all shutter speeds.
Here's a simple breakdown of options in general...
Yongnuo 560 series
1x 560 TX trigger
However many 560 III or I/V flashes you want to add.
Yongnuo 585EX
1x Trigger for the camera and 1x trigger for each flash (no HSS).
Cactus V6II
2x You need at least 2 of these (one for the camera and one for each flash).
Advantage is you can pretty much get whatever flash you want and it'll work for the most part since it's cross brand capable.
You can fire flashes from Pentax, Fuji, Nikon, Canon, Olympus, Panasonic, Shanny, Sigma, Metz.... with control of output, grouping etc from the camera body.
The Cactus V6II will allow wireless radio HSS with HSS capable flashes, such as Pentax, Metz, Shanny, NIkon, Canon, Sigma