dschigusa 5 I bought a popular third-party brand of tethering cable for my Nikon D850, and it didn’t work.So I followed some online advice and got this cable plus a powered USB port. The powered port goes into my laptop, this cable attaches to that, and, finally, the official Nikon cable that came with the camera attaches to this at one end and the camera port at the other end. This ensures a rock solid tether that hasn’t failed me once.