User Activity

I don't use my 600ex-rt mk2 very often and I have successfully used the st-e3-rt to remote control the 600ex in the past, but yesterday it would just not work. Setup: R5 + ST-E3-RT + 600ex-2- 600ex-rt works just fine directly off the R5 shoe- not rel...
I have used the 5DSR + 600EXII setup without issue for about a year on numerous occasions. Last time I used this setup was about 2 weeks ago and noticed nothing unusual. This time around I am unable to use any of the camera buttons when the EX-II is ...