YN 600EX-RT II question

I'm looking at adding a YN600EX-RT II to my camera bag, currently I have a couple of YN586EX-IIs which I trigger with YN-622Cs. I understand that the YN600EX-RT II has built in RF capability, I'm wondering if it will communicate with my 622Cs, or will I have to use it in conjunction wit a 622C (which wouldn't be a deal breaker, I have an extra 622C).

thanks

You have to use it with a 622. The built-in radio trigger is in the Canon RT system, which isn't compatible with the 622 system. Just me, but you may want to consider the YN-685, which has a 622 receiver built-in. It cannot, however, be used as a radio master on the camera hotshoe (you have to sandwich a 622 between it and the camera), and it has no optical slave capabilities at all (either wireless eTTL or S1/S2). It's also a bulkier than a 586.

My personal recommendation (which may not be affordable) is to ditch the Yongnuo gear, and go with Godox TT685-C speedlights and a Godox XPro-C or Flashpoint R2 Pro II (which is not yet out) transmitter. The TT685-C has a built-in radio transceiver (so can be master or slave), and all the optical slave modes, and is kind of like a Canon 600EX-RT clone, only it uses Godox's 2.4GHz radio system, not Canon's RT system. It's also US$110. You don't have to add anything to the foot of the flash to use it off-camera. And if you just want to add a second light where you don't need TTL, there's the $65 TT600, which uses the same triggering system (in exactly the way you can't add a YN-560IV and still have TTL/HSS capabilities with your YN-568EXII). And both will be HSS and have M power control with the same trigger.

The other two neat tricks the Godox TT685-C can do are that if you add a mirrorless camera or switch camera systems, you can still use it as a TTL/HSS/remote power control slave; you only have to swap the transmitter unit for the new camera system. The TT685 can autoswitch to support TTL/HSS with any of the supported camera systems (Canon, Nikon, Sony, Fuji, MFT, and (soon) Pentax). And it'll also work in concert with the larger lights (bare bulb, studio strobe) in the Godox system.

There are reasons a lot of us turned our backs on the incompatibilities of Yongnuo's three separate triggering systems and moved to Godox.