ZoMei 77MM IR 850 Glass Infrared X-Ray Filter Suitable for DSLR/SLR Camera with a 77mm Filter Thread Application: Nature, scenic, often used in crime detection, medical photography, detection of distribution of vegetation, etc. Material: high quality optical glass. Works well with digital cameras, especially mirrorless cameras or DSLRS with no IR blocking filter in front of the sensor. (Please check your camera's owners manual) Effect passes only infrared rays above 850nm Infrared film is also sensitive to ultraviolet rays and the shorter wavelengths of the visible spectrum so it is necessary to filter out all but the infrared rays