Traditional Culture Encyclopedia - Photography major - What kind of filter is nd filter?

What kind of filter is nd filter?

Neutral density, only reduce the amount of light, do not change the color. I am used to using a low-speed shutter when the light is sufficient.

The number after ND represents the multiple of dimming. For example, ND4 is a 4 times 2-speed shutter and ND8 is an 8 times 3-speed shutter.