12-15-2011 (click on any photo to see it larger)
My last post of fall colors in my neighborhood reminded me to share some test shots I took - I wanted to illustrate how much difference a polarizing filter can make on the colors in a landscape photograph.
The photos above were taken with the same camera, the photo on the left was taken without the polarizing filter and the one on the right was taken with the polarizing filter. The right-hand photo has more vibrant color in the leaves and the sky is a darker blue.
Why the difference? A polarizing filter removes polarized light – the degree of removal is based on the angle of the camera and the rotation of the filter. The filter is actually two filters that rotate independently. By rotating the outer filter (the inner one is firmly attached to the front of your lens) you can vary the effect. Any reflections on non-metallic objects are polarized light and the filter can reduce the reflections.
The images below show a close-up example of the differences in color saturation. The photo on the left (no polarizer) gives you an idea of the amount of reflection on the leaves. When the polarizing filter is rotated (photo on the right) the reflections are reduced and you get the true colors of the leaves.
Sunlight is also polarized light, so when you use a polarizing filter, it can make the blue sky seem darker and more dramatic. The effect is most pronounced when you are pointing the camera about 90 degrees from the direction of the sunlight.
Be sure to get a circular polarizing filter (most of them these days are circular). A linear polarizer won’t work well with auto-focus systems and digital sensors. A good polarizing filter can be pretty expensive ($40-$50) and if you have several lenses with different filter sizes, the best approach is to buy a filter for the largest size, and get inexpensive step-up rings to adapt the large filter to smaller lens diameters. In this way, you can use one filter on all lenses.
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