Circular Polarizing Filters (CPL) are an important tool for photographers, as they can help to reduce glare and reflections, improve color saturation and contrast, and reduce haze in an image. In this tutorial, we’ll explore how to use a circular polarizing filter and how it can help you create better photographs.
Why Use A Circular Polarizing Filter?
A CPF is an essential tool for any photographer, as it can help to reduce glare and reflections, improve color saturation and contrast, and reduce haze in an image. It can also be used to darken blue skies, reduce the brightness of reflective surfaces, and minimize the appearance of atmospheric haze.
How To Use A Circular Polarizing Filter
Using a CPF is relatively simple. First, attach the filter to the front of your lens. Then, rotate the filter until you’ve achieved the desired effect. It’s important to note that the effect of a CPF is only visible when shooting in bright, direct sunlight.
Top Ten Photo Ideas to Try with a Circular Polarizing Filter
1. Sunrise or sunset landscapes 2. Reflections in water 3. Wildlife in the wild 4. Long exposures of clouds 5. Reflections in glass 6. Cityscapes at night 7. Forests and trees 8. Mountains and valleys 9. Close-ups of flowers 10. Landscapes with blue skies
Related Topics in Photography
In addition to using a CPF, there are other topics in photography related to contrast that can help you create better photographs. These include using graduated neutral density filters, using HDR photography to capture a wider range of tones and colors, and using flash to create dramatic lighting.
This video is a great tutorial on how to use circular polarizing filters.
Video by PhotoProTips
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- Learn more about filters.
- Learn more about landscape photography.
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How Circular Polarizers Work
A circular polarizing filter consists of two elements: a linear polarizer and a quarter-wave plate. The linear polarizer blocks light waves vibrating in specific orientations, allowing you to selectively filter out glare, reflections, and scattered light. The quarter-wave plate behind it converts the linearly polarized light back into a circular pattern so your camera’s autofocus and metering systems continue to function correctly — older linear polarizers interfere with these systems on modern cameras.
You rotate the outer ring of the CPL to adjust the polarization angle. At maximum effect, the filter dramatically darkens blue skies, eliminates reflections from water and glass surfaces, and cuts through atmospheric haze to improve color saturation and contrast. The effect is strongest when the light source is at approximately 90 degrees to your shooting direction — point your index finger at the sun, and your thumb indicates the direction of maximum polarization.
Practical Tips for CPL Use
Be cautious with wide-angle lenses. A CPL’s effect varies with the angle to the light source, and ultra-wide lenses capture such a broad field of view that polarization becomes uneven across the frame. This creates an obviously darker band of sky on one side of the image that looks unnatural and is difficult to correct in post-processing. For lenses wider than 24mm full-frame equivalent, consider using the CPL selectively or choosing a different approach.
CPL filters reduce light transmission by approximately 1.5 to 2 stops, requiring slower shutter speeds or higher ISO settings to compensate. In landscape photography, this light loss is rarely problematic since you are likely shooting on a tripod anyway. For handheld shooting or action work, the light loss may force compromises. A CPL is one of the few filters that cannot be replicated in post-processing — Photoshop cannot remove reflections from water surfaces or deepen sky polarization the way a physical CPL can, making it an essential tool for outdoor photographers.