Bulb was not possible via tethering on older Nikons, but it is now possible for D800, D4, D600, D7100 and more.
You can find source code here, but you need to port it:
It would allow gphoto to be used for astrophotography, that benefits from exposures between 60s and 360s. Stacking 30s pictures produces lower S/N ratios, important in astrophotography.
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