I originally thought RadioPopper JrX can support ETTL but I now realize it's manual and that's why it's affordable.


I think I still like RP PX the best. But the requirement of having
a master on camera is making the setup not convenient and heavy.


PocketWizard's FlexTT5 seems to have issue on interference.


So everything nails down to the ultimate question:


Why doesn't Canon make their flashes radio-wireless-communicable?


I assume Nikon's flashes also need to "see" each other in order to communicate wirelessly? No?


Please educate me!