When you add the PocketWizard AC3 ZoneController for Nikon to your on-camera MiniTT1 Transmitter or FlexTT5 Transceiver, you instantly have three zones of flash control. Whether in CLS/i-TTL or Manual mode, you have control over all your flashes from your camera position. Put your flashes wherever you want, without worrying about having to access them during a shoot.