· Light rays which are reflected by any surface become polarised and polarising filters are used to select which light rays enter your camara lens.
· They allow you to remove unwanted reflections from non-metallic surfaces such as water, glass etc.
· They also saturate colours and increase contrast.
· Polarizers come in two variations but have the same effect. Linear polarizers work with older camera meters; circular polarizers are designed for today's newer slpit-beam metering systems used in auto focus cameras; check your camera's manual.