absplastic wrote in post #17786884
I'm interested in knowing what, if anything, would be the difference between a system of YN-E3-RT + YN600ex-rt + YN-E3-RX, and a system that is YN-622C-TX + YN685 + YN-622C.
As far as I know, the radio protocol is the only difference
absplastic wrote in post #17786884
Does the Yongnuo 622-based system extend E-TTL or HSS functionality to more legacy speedlites and bodies, is that why it is a popular option?
The 622 needs a camera body that has the external flash menu built into the camera (the 622 has no controls on it other than channel and group selections). The 622 will work with a wider variety of eTTL compatible flashes, not just legacy flashes like the yn-e3-rx.
absplastic wrote in post #17786884
If not, what does it offer than makes it worth considering for Canon shooters?
I think the 622 system is popular because it came before the RT system, and for those not invested in the RT system...it's a inexpensive, simple way to trigger compatible eTTL flashes.
absplastic wrote in post #17786884
I know that both the YN-622C and YN-E3-RX can work as receivers that allow adding monolights to a speedlite setup (via PC cord), which is what I use my YN-E3-RXs for, but is the functionality any different between them?
The 622 can be used as a transmitter as well, but that's the only difference I'm aware of.
How well does the yn-e3-rx work with your monolights? I'm considering adding a monolight to my aresnal, and would like to use the yn-e3-rx to trigger it. I'm assuming it just triggers, but all setting have to be put in manually?