Light rays which are reflected by any surface become polarised and polarising
filters are used to select which light rays enter your camera lens.
They allow you to remove unwanted reflections from non-metallic surfaces such
as water, glass etc.
They also saturate colors and increase contrast.
Polarizers come in two variations but have the same effect. Linear polarizers
work with older camera meters; Circurlar polarizers are designed for today's
newer split-beam metering systems used in auto focus cameras. Check your camera's
manual.
Features
Creates dramatic sky/cloud contrast.
Saturates colors without changing color balance.
Mount rotates to control amount of effect.