Hello,

On http://www.gphoto.org/doc/remote/ it's stated that "Nikon DSLR: We do
not know how to do Bulb capture yet.

At least on my Nikon D3400:
gphoto2 --set-config shutterspeed=52 && gphoto2 --set-config bulb=1
--wait-event=[time] --set-config bulb=0
works as expected.

Cheers!

-- 
Justin T. Leniger
justin.leni...@gmail.com
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