Another filter that is essential to landscape photographers is the polarizing filter or simply called, polarizer. What it does is to reduce the amount of light reflected by glossy materials such as metal, glass, water and even the haze in the air.
Here are three basic examples of the benefits of a polarizer:
Sky – in the photo below, the polarizer creates a more dramatic effect – from a pale blue sky to a more vibrant & deep blue color. The clouds and the landscape’s features are clearly more visible. (Nikon D80 18-250mm, ISO 100 @ 18mm, 1/60 f6.3)
Glass – the most important use of the polarizer is the removal of reflections which is not easily done in post processing. In the photo below, the reflection on the car’s windshield was greatly reduced which allows you to show the car’s interior. (Nikon D300S 60mm 2.8, ISO 200, 1/60 f9)
Take note that because polarizers reduce light, you will need to adjust your settings by 2 f-stops.