If the remote flash is further to the right or left it may not receive any optical signal, even if it is only a few feet from the camera! Radios transmit in all directions from the camera. Most of the optical controllers only cover an area about as wide as a 24mm lens on a FF camera. Most optical systems, especially when using a weak built-in popup flash as the controller, are much more range limited than radio systems. There are disadvantages with using optical wireless communications instead of radio communications, though: Some Nikon cameras have popup flashes that are Commanders, others have popup flashes that are not Commanders. You also could use a Nikon body with a built-in flash that is capable of being a "Flash Commander". Some of those are: Nikon Commander SU-800, Nikon SB-910, SB-900, SB-800, SB-700, and any third party clones. You need any Nikon iTTL capable "master" flash or controller attached to the camera's hot shoe. If you want to use optical wireless (you probably do not) You can buy YN622N-TX + YN622N II sets, or sets of two YN622N II transceivers for around $80. The YN622N-TX transmitter and YN622N/YN6222N II transceivers are about $40 each. The YN622N or YN622N II can be used, but the controls are a bit less intuitive and you'll have to count how many times you click certain buttons. The advantage of the YN622N-TX transmitter is the LCD display and additional control buttons that make it much easier to see how you have your flash(es) set and to change the settings of your flash(es). A YN622N / YN622N II can be used as the receiver attached to the flash's hot foot. A YN622N-TX transmitter or YN622N / YN622N II transceiver (combined transmitter & receiver) can be used on the Nikon camera's hot shoe. To fully control the flash you need a YN622N radio set. If you want to use radio wireless (you probably do) It will have the YN568EX III name displayed in gold lettering. First off, please be sure to get the Nikon version of the YN568EX III.
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