Description: Suitable for DSLR/SLR Camera Filter Thread Application: Nature, scenic, often used in crime detection photography, detection of distribution of vegetation, etc. Works well with digital cameras, especially mirrorless cameras or DSLRS with no IR blocking filter in front of the sensor. Effect passes only infrared rays above 720nm 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 This filter can also be used to achieve an "X-Ray" effect Filters can be used in baby monitoring applications. Using an infrared light source, the parent can view the child in complete darkness without having to turn on a light and disturb child. Specification: Material: high quality optical glass Wavelength:IR720 720nm is suitable for indoor and weak light use. Common problems of IR filters Hotspots Hotspots are a relatively common problem with infrared. It is due to internal reflection of light inside a lens. Normal lenses have coated barrels to absorb light, but these coatings dont always work in infrared, causing these problems. Solution: 1.Hotspots can often be eliminated by changing the aperture. 2.Hotspots occur most often in the same type of shooting angles that cause len. In this case, hotspots can usually be avoided by shooting away from bright sources of light. Package Includes: 1PiecexIR Filter 1PiecexEnglish User Manual .