The RadioPopper PX Receiver to take advantage of eTTL/iTTL, manual and High Speed Sync, all while avoiding the drawbacks of line of sight, short range and sunlight interference, you'll need a PX Receiver. For every off-camera flash you'll use, you will need a PX Receiver. Although the PX receivers and transmitters are compatible with Nikon, each receiver comes with a mounting bracket that is specific to either Nikon flashes.
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As a professional photographer, I use and abuse my gear. I want to ensure that Nikon shooters get the information they need for Nikon speedlights and RP's. Batteries: Keep a full stock of AAA's for RP's. They eat batteries for breakfast. I have rechargebles in the units and at least a full set ready for replacement plus extras in my lightstand bag. For event shooters, I'd start with a fresh set each time you shoot an event Batteries: First option in menu is battery status. b9 is full power, once batts hit b4 or about 50%, you'll experience misfires Batteries: Keep a full stock of AA's for your master flash. Even though you are only using it as the master, it takes a lot of juice to send all that information to the slave flashes Menus: Cryptic. Would like to see a quick-start guide on paper in the box Bracketry: Cumbersome and bulky. If you are like me and are not nimble, you'll fumble around For SB900/910 users, assemble bracket to SB800 setting to allow for SD9 battery pack plug to work. If you use SB900/910 slot, the top of SD9 plug interferes with the bracket making it loose and sit askew: result--misfire. The SB800 slot works fine Use Manfrotto Part #3298 hotshoe bracket, use a bit of Loctite to lock the screw in place, then you can place bracket on any hotshoe adapter avoiding any extra expense for gear you may already have