Reflect ultraviolet and near-infrared emitted from a lamp and permeate the visual spectrum.

It is used to reduce near-infrared from CCD camera

It is used to prevent degradation due to malfunction of stray light or ultraviolet.

To improve reproduction, the film thickness for each material must be controlled with high precision.

The degree of transparent ratio and its planarity are important.

It is also called cold filter. You can remove more infrared by combining cold mirror.