Saturday, March 21, 2009

Polarizing Filters



















I am heading off to Puerto Rico tomorrow for some photography and wanted to write a bit about polarizing filters. Most filter effects can be created in Photoshop, but the polarizer is not replicable through Photoshop - you have to have your filter on your camera while you are out in the field. A polarizing filter serves a number of functions including the two most important - darkening the sky and helping to reduce glare. For instance, a polarizing filter can significantly reduce glare on rocks when you are photographing a stream. Similarly, it can reduce glare on the surface of water so that you can see through to the bottom of a body of water. I have included two images to illustrate this property. The first is a picture taken in midday sun with a polarizer. Instead of being washed out, the sky is dark blue. The second image clearly shows the sand beneath the surface of the water - this is achieved through the use of a polarizer. Without the polarizing filter, the water would have been opaque because of reflections.


I'll have more images when I return!

- Gabby

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