What type of filter transmits all wavelengths equally to minimize color distortion?

The correct answer is a neutral density filter. This type of filter is specifically designed to reduce the intensity of all wavelengths of light equally. By attenuating the overall brightness without altering the color balance, a neutral density filter minimizes color distortion, allowing for accurate color perception in various lighting conditions. This makes it an essential tool in photography and optical applications where maintaining color fidelity while controlling exposure is necessary.

In various practical contexts, like exposure control in photography, using a neutral density filter enables the photographer to use wider apertures or slower shutter speeds effectively while preserving the overall quality and color of the image. This attribute differentiates it clearly from other types of filters that may selectively transmit certain wavelengths, leading to potential color shifts or distortions.