Benefits Drops into EF 800mm f/5.6L IS USM and EF 200mm f/2L IS USM lenses Built-in gearing rotates the filter when it\'s inside the lens, to vary the intensity of its effect. Reduces the appearance of reflections in non-metallic surfaces Makes colours appear more saturated Compatibility EF 200mm f/2L IS USM EF 300mm f/2.8L IS USM EF 300mm f/2.8L IS II USM EF 400mm f/2.8L IS USM EF 400mm f/2.8L IS II USM EF 400mm f/2.8L IS III USM EF 400mm f/4 DO IS USM EF 400mm f/4 DO IS II USM EF 500mm f/4L IS USM EF 500mm f/4L IS II USM EF 600mm f/4L IS USM EF 600mm f/4L IS II USM EF 600mm f/4L IS III USM EF 800mm f/5.6L IS USM EF 200400mm f/4L IS USM Extender 1.4x