I had a 5D4 and I am familiar with this and all the menus. The R is a little different but I am having a problem. I'm trying to set up C1-C3. I'm starting in Av mode and after registering C1 the front dial seems to be in Tv. mode. I thought it was suppose to maintain the mode you last had it on before going registering a C mode? I cleared the settings several times and tried again. I just cleared the C1-3 functions again. 1. In AV turning the dial clockwise Av increases - Tv decreases 2. In TV turning the dial clockwise Av decreases - Tv increases 3. Then I went from AV mode to C1 and registered. Now turning the dial clockwise Av decreases - Tv increases. Just like being in TV mode. Is the there something I'm missing? Thanks in advance.