Lets say you arrive at a high contrast scene, - you take a light reading of the sky and get an exposure reading of F/22 at 1/8 second; you take a reading from the ground in front of you and get a reading of F/22 at 1 second. This is a difference of three stops of light. You need to reduce the brightness of the sky. By using the 0.9 ND you will reduce the light in the sky by three stops without affecting the light hitting the ground in front of you.

Polarizing Filters: A polarizing filter should be top of the list - a polarizing filter can be used with colour or black and white and is probably the most important filter on the market today. The polarizing filter will also darken the blue sky to give it a strong rich colour. It will make mist stand out and can be also used to give fast flowing water a misty effect. This filter is most effective with side lighting.

Warm-up filters: In overcast conditions, don’t put your camera away. This is an ideal time for you to switch your attention to landscape detail. On an overcast day images often appear cold and dull. Try using a warm-up filter. These filters will remove the dull effect that you get shooting without the sun.

The 81-series are the best choice and will give your images an extra bit of life. An 81A warm-up filter is ideal to use in adding extra warmth to low light images.