Using a polarizing filter can increase color saturation in your images by reducing reflections from water, glass, leaves, and other non-metal surfaces. ... Polarizing your view of the sky will prevent randomized blue light from coming into your lens, leaving you with the purest blue light possible.

When should you not use a polarizing filter?

Bear in mind that a polarising filter will reduce the amount of light reaching your camera's sensor by as much as two or three f-stops, so you should avoid using one in low light situations. This includes during blue hour, when shooting at night, or when photographing the Aurora Borealis.

What is the main purpose of a polarizing filter?

A polarizing filter or polarising filter (see spelling differences) is often placed in front of the camera lens in photography in order to darken skies, manage reflections, or suppress glare from the surface of lakes or the sea.