Even if you use an external trigger (which I recommend), you can still hook
up the cameras via USB and gphoto.
When triggered, the cameras will generate a PTP event over USB, that gphoto
can react to.
I use such a setup to let gphoto automatically download all new photos to a
PC, while I am triggering 6 cameras together using a hardware trigger box.
You should beware that downloading pictures from the camera can sometimes
cause its realtime operating system to miss deadlines (at least in the case
of my Nikon D3200 cameras), and trigger a little later. So if you're
shooting multiple shots sequentially, you might want to defer downloading
the pictures until the camera has no more pictures to take.
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