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It is compatible with both the R1 and the R1C1 systems. IF you go to www.nikonusa.com, and go to your camera section. Under the "compatible with" tab, you'll see the accessories that can be used with your camera, or conversely, if you search for the R1 you'll see which cameras are compatible with it. In general, if your camera has the CLS system, it should be compatilble, if it doesn't you can still use using cables attached from the camera to the flashes,
Sorry, there was a problem. Please try again later.The D3100 doesn't have the feature for Commander Mode with the built-in flash. You will need to use the SU-800 commander to work with the R1.
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