In infrared photography, the filter makes the sensor sensitive to infrared light & blocks visible light. see more on Facebook https://www.facebook.com/bluechiclet/media_set?set=a.2424529504275860&type=3 description on Wikipedia
in infrared photography, the filter makes the sensor sensitive to infrared light & blocks visible light. This part of the spectrum is aka near-infrared, the in-camera effect is faux-color or black & white images, soft, hazy ,dreamy effect, aka the "Wood Effect," & happens mostly to foliage as it reflects the way visible light reflects from snow. Chlorophyll fluorescence, is not really the cause of the brightness seen in infrared photographs. The effect is named after the infrared photography pioneer Robert W. Wood. Dark sky , atmospheric haze, are caused by reduced Rayleigh scattering , elastic scattering of light ... and Mie scattering, aka the Lorenz–Mie solution... , and gives a soft milky haze to portraits, although eyes are likely to be dark. To get started shooting infrared, you can read more about infrared photography on Wikipedia https://en.wikipedia.org/wiki/Infrared_photography , or also try Digital Photo Magazine https://www.dpmag.com/?s=infrared