Purchased Yongnuo Wireless n3 2.4 ghz for remote shutter release off Amazon but they're not working. They're not auto focusing as described or releasing the shutter. If I press shutter release on the camera to half way then press the remote the shutter releases.anybody any info on these units are they faulty or they not compatible with d3100 even though on site, seller state they are. Any help greatly appreciated.
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