Neewer 77mm 650nm IR Filter Infrared Photography Optical Grade Filter for Canon Nikon Pentax Olympus Sony Samsung Sigma and Other Digital SLR Camera Lenses with 77mm Filter Threads Size: 77mm Material: high quality optical glass 650nm Infrared Filter 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. IR650 passes only infrared rays above 650nm. Infrared filter often used in crime detection, medical photography, detection of distribution of vegetation, etc. For photographer, this filter can be used with infrared film or digital photography to get interesting artistic and sometimes creative photos.