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<blockquote data-quote="yauman" data-source="post: 275194" data-attributes="member: 15418">There's a confusion in the use of the word &quot;wireless.&quot; Wireless can be Radio Frequency (RF) or Infra Red (IR) driven.&nbsp; The Nikon speed lights in the remote mode are fired by the light from the master unit, whether it's another speed light on the camera or the built in pop up unit, it's still require that the remote unit has a direct line of sight to the camera.&nbsp; It fact it's has to be the direct line of sight to the little red sensor window on the left side of the SB700, 800, 900, 910 unit. If you mount the unit with the sensor window facing away from the master, it may not fire or get the necessary info from the camera during the preflash stage. If you look at the sensor window on the SB910/80/700 you'll notice it's covered with a very dark red lens - that's because it only uses the very far red part of the light spectrum to fire - not quite Infra Red (IR) but very close to it - so it's usually referred to as IR and that's how the Nikon CLS system works in wireless mode.The addon remote units like the Yonguo or Pocket wizards fires using Radio Frequency (RF) at 2.4 Ghz and so there's no need for line of sight - the remote speed light can be inside a soft box or even in another room!</blockquote>

[QUOTE="yauman, post: 275194, member: 15418"] There's a confusion in the use of the word "wireless." Wireless can be Radio Frequency (RF) or Infra Red (IR) driven. The Nikon speed lights in the remote mode are fired by the light from the master unit, whether it's another speed light on the camera or the built in pop up unit, it's still require that the remote unit has a direct line of sight to the camera. It fact it's has to be the direct line of sight to the little red sensor window on the left side of the SB700, 800, 900, 910 unit. If you mount the unit with the sensor window facing away from the master, it may not fire or get the necessary info from the camera during the preflash stage. If you look at the sensor window on the SB910/80/700 you'll notice it's covered with a very dark red lens - that's because it only uses the very far red part of the light spectrum to fire - not quite Infra Red (IR) but very close to it - so it's usually referred to as IR and that's how the Nikon CLS system works in wireless mode. The addon remote units like the Yonguo or Pocket wizards fires using Radio Frequency (RF) at 2.4 Ghz and so there's no need for line of sight - the remote speed light can be inside a soft box or even in another room! [/QUOTE]

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