Light which falls on electrically insulating surfaces, e.g. glass, plastic, glossy lacquer or water, at an angle (not perpendicular) is polarized by reflection to an extent that depends on the angle of incidence. Consequently, its waves do not oscillate in all directions, but mainly or exclusively on a “polarization plane”. Therefore polarizing filters or shorter polarizers permit weakening, complete elimination, but also enhancing of reflections. A blue sky can be coloured more intensively and the colour saturation of landscapes can be enhanced by eliminating the bluish veil. The effect of these filters cannot be replaced by a digital imaging software at a later date.
The HR Digital Circular Polarizing Filter is characterized by the following features:
Due to a 7 layer multi-coating the transmission of light is especially high and reflection very low. Therefore double images and stray light can be avoided even better.
An extra protection layer which is extremely scratch-proof, water-repellent and dirt-resistant makes the glass plates more robust. This layer does not have any influence on transmission, it keeps the surface clean for a longer time and allows easy cleaning.
Due to its minimal heat extension even for heavy variations in temperature, the brass mount does not create any quality-reducing mechanical tensions in the filter glass. Furthermore, the danger of getting stuck in the filter thread of the lens is reduced by the high slide capacity of brass.
