They are not as popular as circular polarizers for compatibility reasons but you can still find linear polarizers on the market and usually, they are cheaper than circular polarizing filters.

A circular polarizer is still the best option for most mirrorless cameras. Since mirrorless systems rely heavily on electronic viewfinders and autofocus systems, a linear polarizer can interfere with these functions. The circular polarizer, on the other hand, allows the camera to accurately meter light and focus, providing you with the best results.

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Polarizer filters help by blocking certain light waves from reaching your camera’s sensor. When you attach a polarizer to your lens, you can control how much-polarized light gets through, cutting down glare and enhancing the natural colours of your scene. Both circular and linear polarizers achieve this effect, but they do so in slightly different ways.

Both circular and linear polarizers are used in photography. If you’re using a modern digital camera with autofocus and metering systems, a circular polarizer the best choice. It’s versatile, easy to use, and highly effective in a wide range of scenarios. If you’re shooting with a manual film camera or have specific needs that don’t rely on autofocus, a linear polarizer might be the option, especially if you’re looking for a budget-friendly option.

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Linear polarizers do linear polarization and consist only of one layer. However, because the light remains polarized in a single direction, it can confuse your camera's autofocus and metering systems. Those systems are perpendicular to the camera sensor and, therefore, the incoming light gets crossed-polarized. This makes linear polarizers more suitable for older manual cameras where autofocus isn't a concern.

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Linear polarizers are mostly used in film photography with manual cameras where autofocus and complex metering aren’t an issue. Overall, linear polarizers can still be useful in specific scenarios where the photographer has full control over the camera settings.

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Polarizing filters are available in two options: linear and circular. They both help reduce glare, enhance colours and add depth to your photos. What’s the difference and which one should you use for your camera, a circular or linear polarizer, you will find out in this blog.

To understand the difference between circular and linear polarizers, you first need to know how they interact with the light. When light reflects off surfaces like water, glass or even leaves, it vibrates in a particular direction and becomes polarized. This polarization is what causes glare and reduces the colour intensity in your photos.

Circular polarizers were developed later to solve the problem of possible cross-polarization in digital cameras. They consist of a linear polarizer and a quarter wave plate that twists the light waves back into a circular pattern. This design allows the camera's autofocus and metering systems to work correctly, making circular polarizers compatible with most modern cameras.

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While you can technically use a linear polarizer with a mirrorless camera, it might cause issues with autofocus and metering, just as it does with DSLRs. If you're using a manual focus mode and have a specific need for a linear polarizer, it can work, but it’s not an optimal solution.

If you already have a polarizer and doubt whether it’s circular or linear, you can check it in a matter of seconds. Linear polarizer works in both directions, regardless of what side of the filter you put. The circular polarizer works only in one direction because of how it’s built. Just check if the filter works from one or two sides.

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Circular polarizers create exactly the same visual effect as linear polarizing filters because they actually contain the linear polarizer inside.

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A circular polarizer is the go-to filter for most photographers using modern digital cameras. That's the safest option since it doesn't let the polarized light interfere with your camera's autofocus or metering systems. When you rotate the filter, it adjusts the amount of polarization, allowing you to control the intensity of the effect. They are also compatible with old cameras that work with linear polarizer.

While both types of polarizers serve the same function, their structure is different as well as the way they modify the light waves.

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