What is the Difference Between Circular Polarizer and Linear Polarizer?

The main difference between circular polarizers and linear polarizers is their effect on camera systems when they have internal reflective surfaces, such as a through-the-lens metering system or autofocus. Both linear and circular polarizers serve the same purpose, reducing reflections on glass surfaces, increasing color saturation in foliage, and darkening a blue sky.

A circular polarizer consists of two elements: a linear polarizer and a second layer called a quarter-wave plate. The quarter-wave plate "spins" the light after it goes through the linear layer and before it enters the camera lens. This extra layer addresses the issue of cross-polarization on other reflective surfaces inside the camera, which can cause issues with metering or autofocus.

In summary:

• Circular polarizers are more versatile and suitable for all digital cameras, including those with through-the-lens metering systems or autofocus.
• Linear polarizers are less expensive and provide the same polarization effects as circular polarizers, but they may cause issues with metering or autofocus in some camera systems.
• Both circular and linear polarizers reduce reflections, increase color saturation, and darken skies, but their effects on camera systems with internal reflective surfaces differ.

Comparative Table: Circular Polarizer vs Linear Polarizer

The main difference between a circular polarizer and a linear polarizer is the way they polarize light and how they interact with camera systems. Here is a comparison table highlighting the differences:

Both circular and linear polarizers serve the same purpose in reducing reflections, increasing color saturation, and darkening blue skies. However, circular polarizers are compatible with all camera systems, including those with phase-detection autofocus and beam splitters, while linear polarizers may cause issues with these systems in some cases.