Quality begins in front of the lens, and as is generally known, that is where the filter is. A filter must not restrict the performance of the photographic lens.
An important criteria for a perfect B+W filter is a high-quality coating, also known as an antireflection coating. With a B+W filter, such layers are evaporated by means of thin-layer technique, a quite complex coating process. The coating material consists of special substrates that are applied in one or more layers depending on the coating system.
A coating changes the reflection properties of an optical surface as in our case of the filter glass. An uncoated glass surface reflects about 4% of the incident light rays on each glass surface.
The system of thin, vaporized layers is configured in such a way that less light is reflected and more light passes through the layer itself and the glass. In this way, higher light transmittance is obtained which enables brighter colors and higher image contrast to be achieved.
B+W filters are always coated on both sides. Consequently, ghost or double images, which can be caused by back-reflection from the image sensor, are attenuated many times and, depending on the shooting situation, completely eliminated.
With the B+W single layer E coating, the light reflection on the filter surface is reduced to an average of less than 2%. With perfected multi-layer systems such as the B+W Multi Resistant Coating MRC and MRC nano, this residual reflection is well below 0.5% and is thus practically reflection-free.
Improves light transmission from about 92% (uncoated glass) to about 98%
MC Nano coating makes it easier to clean the filter - water will bead up faster
B+W filters provide additional benefits of correction for Ultraviolet(UV) light which can register on film and videotape as a bluish cast and can obscure distant details
If desired they can be left on the lens at all times for protection
Ultraviolet filters allow you to correct for the UV effect to varying degrees
UV filters are ideal for high altitude photography, by the sea and in regions with very clean air
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