Video shutter speeds

For D810 video, shooting at 24 fps, I would have to set the shutter speed to 1/50 sec. However, I can only set it to 1/45 or 1/60. How can I set it to 1/50 sec?

You have your camera set to meter in half stops. Instead set it to third stops, and you will see 1/40 and 1/50 instead of 1/45. Menu b1, b2, and b3, all ought to be 1/3 steps. There's no reason to use half stops, third stops offers greater precision in the exposure settings. 1/3 stops are the normal defaults.

Thank you, Wayne. This reply was useful. The Nikon D810 is an amazing piece of equipment. However, mastering it is a steep learning curve.
Kind regards
GerritJan