Canon 4774B001 (47-74-B0-01, 47/74/B0/01, 47 74 B0 01 47 74-B0/01) 52mm PL-C Drop-In Circular Polarising Filter (WII)
- 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
- 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