- Polarising filters,nnPolarisers enhance colour and contrast. Reflected light often appears as a whitish glare that washes out the colour of an image. nA polariser corrects this problem by producing deep, dramatic blue skies. nIt also eliminates reflections on non-metallic surfaces, such as glass and water. nColour saturation in general, particularly outdoors, can be significantly enhanced. n- Polariser/Circular PolarisernnEssential colour filter for general outdoor usenProduces deeper skies and minimises reflections in black-and-white and colour photographynCombine a polariser with a Red 25 filter for incredibly dramatic black-and-white landscapesnCan be rotated to achieve the desired effectnUse the Tiffen polariser with the enhancement filter for more dramatic effectsnAvailable for wide-angle lensesnnA circular polariser has the same effect as a polariser and is used on cameras with beam-splitting metering systems commonly found on autofocus SLRs (for most 35mm autofocus cameras, consult your camera manual).nMost effectively polarised sky area with a circular polariser:nPoint your index finger towards the sun. With your thumb extended at a right angle (90°)