36GBTo set the lighting ratioof the commander unitPress the Fn button on this flashunit and specify the power levelratio setting for the A, B, and Cgroups.Example: When the flash powerlevel ratio [4:2:1] is displayed onthe LCD panel, the flash unit ineach group fires with a fractionof the total flash power: 4/7, 2/7,and 1/7, respectively.Multiple wireless flashphotography (groupflash photography)You can perform wireless flashphotography among a maximumof 5 groups including thecommander unit and 4 groups ofoff-camera flashes. To performgroup flash photography, specify[GROUP] for the flash modesetting.Commander unit: HVL-F45RM(this flash unit) or a radiowireless commanderReceiver unit (off-camera flash):HVL-F45RM (this flash unit) or awireless receiverYou can specify [TTL], [MANUAL],or [OFF] for the flash mode ofthe A, B, and C groups. For the Dand E groups, on the other hand,you can specify either [MANUAL]or [OFF].The flash units in the group withthe flash mode specified as [OFF]do not fire.To set up for groupflash photographyPress the Fn button on this flashunit and specify the flash modesetting, the flash compensationsetting, and the power levelsetting for the A, B, C, D, and Egroups on the screen for settingthe group flash mode. Flash mode setting Flash compensation/powerlevel setting