Summary: What it does: It hides most (not all) the visible light generated by your pop-up flash. Why? When using the pop-up flash to trigger other flashes, it still has to flash (at a very low power) to generate the light needed to trigger the other flashes. Sometimes this adds unwanted light, can be seen in shinny objects, adds a second catch light in the eyes, and your subjects will see an annoying pre-flash that can make some people blink.
Summary: Being unaware that there is a problem with the locking mechanism of this device, I put the SG-3IR and locked it on my camera’s (D700) flash shoe. Then, as you may guess, I found it impossible to disengage it from the shoe, since I didn’t know for sure which direction to apply a force to and how much force it might be needed.
Summary: This product essentially serves as a low tech though equally capable replacement for the SU-800 infrared TTL transmitter, which costs around $250. The bang for the buck on this little piece is very high. I setup test flashes all around the main level of my house and the on-camera pop-up flash with this SG-3IR in front of of it was able to trigger them with remarkable reliability.
Summary: I was excited to know that my D300 would control remote flashes with the built in CLS. This was until I started to use it for protraits. Some subjects will react to the "control" flashes and blink. This REALLY improves the situation. My wife was the first to show this. This little item blocks the direct flash and she no longer blinks. I have even used it outdoors in the sun without too much problems.
Summary: I've always used the built in flash on my D300 to trigger off camera flash. One annoying thing that happens is that I get two catchlights in the eyes of my subject (one from the built in and another from the off camera flash). This really annoyed me so I got the SG-31R and it works perfectly. It fits easily on the hot shoe and is actually quite durable considering its all plastic. Definitely a must buy for any Nikon wireless flash user.
Summary: I use this with a D200 and the built-in flash in "Command" mode. My SB-800 is on a Stroboframe Flip bracket and set to receive IR info from the camera via the built-in flash. This seems to be the best way to shoot vertical images without throwing a shadow to the side of subjets in low light people photos. This is also good for showing texture for CSI type photos when holding SB-800 off to the side (tire tracks etc).