The Hoya 55mm R72 Infrared Filter is a specialized filter used for infrared photography with digital cameras and specialized infrared film. This nearly opaque filter blocks all visible light up to 720nm, enabling recording of subject matter and scenes that are not visible under normal conditions. Due to the nature of infrared photography, the filter factor for this filter is highly variable and depends largely on the ISO sensitivity in use and lighting conditions.

This filter is constructed from high-quality optical glass and is set in an aluminum filter ring to provide increased rigidity and prevention from filter jamming.