The Kenko Circular Polariser is an ultra-slim filter specially designed
to reduce reflections and glare from non-metallic surfaces, such as
water and glass. It will also help to greatly reduce the softness which
can be caused by atmospheric haze and will improve colour saturation as
well as contrast in subjects such as blue skies and clouds. The Kenko
circular polarising filter has been designed with a slim frame to reduce
vignetting on wide-angle lenses and is rotatable to allow full control
over the effect.