Like most digital cameras the Nikon D750 has a color setting for monochrome. And like most higher end cameras the options within the monochrome menu include different "filters." You can set the red filter to make skies dark and dramatic with puffy, white clouds. You can set green to get nicely nuanced skin tones and you can set yellow to get a good overall balance between the colors with the sky going darker than it would with the filter boxes left unchecked. This is just the way panchromatic films worked with actual, colored glass filters.
Just like most other high end cameras the Nikon will also let you fine tune sharpness, contrast and brightness. But where the Nikon shines for my use is that they've included a "clarity" slider that allows you to have some decent control over the mid-tone contrast.
My recent experimentations are showing me that I can fine tune the camera in monochrome to get a look that's very close to what I used to aim for in the darkroom when using various Agfapan B&W emulsions and my favorite print papers.
If you are shooting with a current Nikon model you owe it to yourself to go deep in the settings menu and see just how far you can go in fine tuning your camera to your own black and white vision.
I like it.