ZOMEI 55MM IR 850+950 X-Ray Glass Infrared X-Ray Filter 2 Piece Suitable for DSLR/SLR Camera with a 55mm Filter Thread Application: Nature, scenic, often used in crime detection, medical photography, detection of distribution of vegetation, etc. ZOMEI IR Filter: This Filter Will Filter Out Most Light Below And Above The Wavelength Of 850+950 Nanometers (Infrared) Use for photography with infrared films. 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