https://community.usa.canon.com/t5/Speedlite-Flashes/group-mode-with-600-rt-problem/m-p/83852#M2154 <P>Having trouble with the 600 rt in group mode. I have two 600 rt's and a 5d mk3....I have been trying to use these in group mode with limited success. I was trying to use the groups in ettl mode. My on camera flash is the master and the off camera is set to group B. I adjust the master flash compensation right on the camera control. I kept it at no compensation...now I adjust the compensation on the slave via the master flash panel....it took almost two neg stops to keep it from blowing out the subject which is a white bowl. It definitely does dial down the slave....but the settings never actually show up as changed on the back of the slave lcd. When I set the slave to manual mode and change the settings...they DO change on the back of its lcd...is this normal?</P> Mon, 07 Apr 2014 17:08:19 GMT echelonphoto 2014-04-07T17:08:19Z https://community.usa.canon.com/t5/Speedlite-Flashes/group-mode-with-600-rt-problem/m-p/83852#M2154 <P>Having trouble with the 600 rt in group mode. I have two 600 rt's and a 5d mk3....I have been trying to use these in group mode with limited success. I was trying to use the groups in ettl mode. My on camera flash is the master and the off camera is set to group B. I adjust the master flash compensation right on the camera control. I kept it at no compensation...now I adjust the compensation on the slave via the master flash panel....it took almost two neg stops to keep it from blowing out the subject which is a white bowl. It definitely does dial down the slave....but the settings never actually show up as changed on the back of the slave lcd. When I set the slave to manual mode and change the settings...they DO change on the back of its lcd...is this normal?</P> Mon, 07 Apr 2014 17:08:19 GMT https://community.usa.canon.com/t5/Speedlite-Flashes/group-mode-with-600-rt-problem/m-p/83852#M2154 echelonphoto 2014-04-07T17:08:19Z