Does Nikon d8 10iso noise reduction need to be set to the highest level?

Generally put the standard (high ISO) or close to (ISO 100-800). Although setting the noise reduction to high can reduce the noise, the resolution of the photo will be greatly reduced. In addition, long exposure noise reduction can also be turned off, otherwise the internal processing time of the camera after each photo is taken will almost double the exposure time when shooting at night. Please refer to page 299 of the user manual for details.