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The amount of light that is able to pass through the lens and reach the eye. Determined by the degree of darkening of the lens.
The category of the shading filter does not affect the UV protection filters and the polarization filter, it determines the degree of dimness of the lens of a given eyepiece model.
Polarized lenses are responsible for reducing glare from flat surfaces, e. g. of the water sheet. The reduction of glare makes the image sharper and the colors more saturated.