It seems that Nikon has decided to switch from using a standard USB cable and their GPS cable to control their cameras to using just a standard USB cable like Canon does. The old method had one advantage that it could at least in theory download images faster since it could both transfer the image and send shutter commands simultaneously on two separate cables. There was also the disadvantages of requiring more equipment, being more expensive and having less support since people seemed reluctant to write software for the Nikon’s dual cable setup.
From what I am seeing, starting with the Nikon D610, D7100 and D5300 these lines of cameras are controllable for long exposure work with only the standard USB cable. This hopefully will result in a much wider availability of Nikon camera control software as well as increasing the use of Nikon equipment at the telescope.
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