Digital Camera World

Soak up some rays

Mark Hamblin shows you how to get the most out of an essential component in any photograph­er’s kit

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With the advances in postproduc­tion software, it’s now possible to do almost anything to your images after you’ve fired the shutter, but there’s one filter that’s difficult to replicate effectivel­y, and that’s the polariser. A polariser has many uses, but its primary function is to reduce the amount

Two types of polariser

The most common type of polariser is the circular screw-in type made by the likes of Hoya and B+W. These come in various diameters, and you’ll need to buy one for each size of lens you own. A slot-in polariser, such as from Lee or Cokin, is used with a filter holder.

When to use one

A polariser is typically used when shooting in bright sunlight, but it can also be effective in overcast conditions to increase saturation, although the results tend to be more subtle. A polariser reduces the amount of light reaching the sensor by upto around two stops. of glare from non-metallic reflective surfaces such as water. It also removes the small reflection­s from leaves and other foliage, saturating the colour and giving the landscape extra punch. Its other main use is for intensifyi­ng the colour of blue skies and making white clouds stand out. A polariser also helps to reduce atmospheri­c haze.

How to use one

The effect of a polariser can be seen by rotating the filter on the front of the lens or in the holder. The degree of polarisati­on depends on your shooting position in relation to the angle of sunlight. It’s most noticeable when you’re photograph­ing at a right angle.

Watch out for…

Polarisers often produce uneven results when using a wide-angle lens because some parts of the sky are more polarised than others. It’s most noticeable in a blue sky, with the more polarised area appearing darker. The effect can be lessened by increasing the focal length.

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