Walimex pro per drone filter CPL

Usage
The polarizing filter is still one of the most commonly used filters in photography. Polarizers only allow light of a specific vibration level to pass through. All other light rays are filtered out. This filtering results in a reduction of reflections on glass and water surfaces or paints. At the same time, they increase color saturation and enhance contrast. Objects behind glass (shop windows, car windows) become visible again. In landscape photography, the polarizing filter achieves its maximum effect at an angle of 90 degrees to the sun.

Functionality
Circular (CPL) and linear polarizing filters operate on the same principle. Optical grids on the filter film ensure that only linear light waves that align with the grid can reach the lens. Unlike a linear polarizing filter, the circular polarizer has an additional lambda/4 plate. This plate is responsible for breaking down the linear light rays that were previously created in the polarizer back into all their components, standing at a 90-degree angle to each other. At the same time, one component is delayed by a quarter wavelength. Thus, all polarization directions are present behind the filter again.

The polarizing filter is the only filter whose effect cannot be achieved later through image editing software. Reflections must be eliminated at the time of capture; it is no longer possible afterward.