Just testing the 7D Mark II’s wireless flash control. I really like that it can control my 430 EX II from just the popup flash. The system is pretty slick, with several choices: Built-in and external controled via the ratio of each to the other. External only. Both but with independent exposure compensation for each. This is my cat with the 430 EX II at lower right with a 3:1 ratio to the popup flash.