What is a characteristic of neutral density filters?

Neutral density filters are designed to uniformly reduce the intensity of all wavelengths of light that pass through them. This characteristic allows for the consistent management of light exposure without altering the color balance of the light being transmitted. As a result, these filters can effectively decrease the overall brightness of a scene while maintaining an accurate representation of the colors within it.

This uniform attenuation makes neutral density filters particularly useful in various optical applications, including photography and scientific instrumentation, where control over light intensity is essential for achieving the desired image quality or experimental conditions.