Is it possible to use wireless/remote ratio flash?
Yes, it is possible when using the dedicated external flash units. A700 with two flashes (two groups) ratio control: Use HVL-F58AM as wireless controller and additional HVL-F58AM or HVL-F42AM as remote flash. A700 with three flashes (three groups) ratio control: Use HVL-F58AM as wireless controller and additional HVL-F58AM or HVL-F42AM as remote flash 1 and additional HVL-F58AM as remote flash 2.