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Hi Charles,The Paul Buff CyberSync System fits your requirements. Keep in mind that they require Manual flash control.If you want i-TTL flash control your choices are much more limited.The Pocket Wizard FlexTT5 and MiniTT1 or the Radio Poppers system are the top two options.Since the Transmitter will be in your D90's hotshoe, the built in Speedlight will not work.Good Luck and Enjoy your Nikons!