I could take a guess, but also not experienced with DSLRs on Ekos.

DSLR drivers used by Ekos are almost always the gphoto library.
If we look at the cameras supported by gphoto: www.gphoto.org/proj/libgphoto2/support.php
you can see that the D600 is listed. The D5100 is listed as "PTP mode" and there is a Nikon J4 listed, but is that the same as Nikon 1 J4?

As far as PTP (which apparently is en.wikipedia.org/wiki/Picture_Transfer_Protocol), I'm not familiar with that. Is there something you need to set in your camera to make it respond to the PTP protocol?

Probably the simplest way you can debug this, if you were interested in pursuing it, and you were comfortable with running linux command-line programs, would be to run the gphoto client as a stand-along program outside of Ekos. If that can't manipulate your cameras, then for sure Ekos won't either.

See
www.gphoto.org/
www.gphoto.org/doc/manual/ref-gphoto2-cli.html

Hope that points you in the right direction.
Hy

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