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Nikon D850 Cable Release R20 Message

cable release issue

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Has anyone had this issue before and if so how was it resolved. I have a Nikon D850 that was working fine for two years using a cable release. Then all of sudden I started getting an r20 "error" ONLY when using the cable release. Using the shutter button works fine. I tried 4 different memory cards..all were reformatted. I bought a new cable release and that didnt help either. The cable release works fine with my D780 so I know the cable release is not the issue. Ive done a factory settings reset on the camera and that didnt work. And I just recently update the D850 firmware and I am still having this issue. If anyone has any ideas or suggestions it would be very much appreciated.




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What cable release do you use?