So rather than creating a Wi-Fi network, this one allows the D4 to join an existing one. As you can see in the photo above, they were able to control the D4 using the official Nikon iPhone app. Seeing as there's no Eye-Fi option for the D4 due to it using CF and XQD cards, this is a far more affordable option than the WT-5. There are some caveats — primarily that the VAP11G needs an external powersource to function. Since it uses the D4's Ethernet port to function, it's not clear if it can be tweaked to work over USB for other cameras.