Drops into EF 300mm f/2.8L IS II USM, EF 400mm f/4 DO IS II USM, EF 400mm f/2.8L IS II USM, EF 500mm f/4L IS II USM and EF 600mm f/4L IS II USM lenses. Reduces the appearance of reflections in non-metallic surfaces. Built-in gearing rotates the filter when it's inside the lens, to vary the intensity of its effect and makes colors appear more saturated.
