How about German B WUV mirror?

Germany's BW UV mirrors have always been the industry standard, and they are better than those produced in Japan. Now most of the high-end mirrors are monopolized by BW.

However, some photographers who pursue colorful photos prefer to use Japanese mirrors. Because German ytterbium is a bit quite satisfactory.

The perfect combination of tradition and innovation of high-quality lenses from B+W

All this stems from "Made in Germany"

B+W Company was founded by Biermann and Weber in 1947 (the trademark of B+W was formed by the names of the two founders), and then merged with Schneider Company in 1985, and was established in Bad Kreuznach, Germany. Thanks to the cutting-edge optical technology research and development strength, B+W filter products stand out in the field of multi-layer terbium plating (MC). Therefore, B+W Company became the first manufacturer of MRC multi-layer terbium plating lens products in the world that can provide waterproof and antifouling.

2 filters were born to solve the difficult problems of photography, but the creative use of filters can bring beyond imagination. They can change and control colors; Strengthen or weaken the contrast; Prevent some light from entering; It can produce unpredictable picture effects with the naked eye to achieve extremely original use purposes.

filters can achieve special effects that can't be created under normal circumstances in the simplest and most intuitive way, and at the same time, many effects can't be achieved by using digital post! Of course, the filter products developed by B+W for digital photography are more forward-looking and have the highest quality and perfect compatibility with digital cameras and lens systems on the market.

in order to achieve the perfection of optical quality and the strict requirements from top photographic equipment manufacturers, the lens glass raw materials of B+W filter are all from Schott glass, which is one of the highest quality German optical glass manufacturers in the world.

3 In the B+W factory in Bad Cruznach, Germany, the filter products are produced by advanced industrial equipment, which not only reach the extremely precise processing level, but also have a variety of varieties and various caliber specifications. All the production steps of each filter are subject to extremely strict quality management to ensure that they meet the highest quality standards of B+W finally. All this can make us confidently promise that B+W products are made in a strict attitude. Moreover, continuous improvement and innovation enable users to achieve higher or even the highest image quality, which is also one of the purposes of B+W.

relatively speaking, a cheap filter will reduce the imaging quality of a high-quality lens. In other words, choosing a filter is as important as choosing a lens. Through this manual, I hope to help you understand and know the brand B+W, and please remember that the image quality is often determined by the filter at the front of the lens.

Computer-controlled production process ensures the quality of B+W.

B+W lenses only use the best optical glass materials.

B+W uses the most advanced vacuum plating equipment to treat the lens surface.

From design to final inspection, the manufacturing process at each stage is strictly controlled to ensure that the optical image quality is completely presented.

B+W lens technology

terbium plating of b+w lens

At first glance, it seems that the terbium plating process of filter is not as important as that of lens plating. Because the filter has only two air contact surfaces, similarly, the polarizing film of the B+W polarizer is integrated with the glass, and there are only two air contact surfaces. However, the photographic lens has at least 6 to 8 air contact surfaces, so it is indeed extremely important to use terbium plating to increase the light transmittance of the lens.

the question is, can we turn a blind eye to the negative factors brought by the filter without terbium plating? Recent research shows that high-level plating technology can really optimize the image quality, especially in scenes with high contrast and high brightness light source.

the data show that the light loss rate of two air contact surfaces of a common single-layer terbium-plated filter is about 3%, while that of a multi-layer terbium-plated filter is only .5%. The single-layer terbium-plated filter can reduce glare and reflection by 1/3, while the possibility of glare and reflection by multi-layer terbium-plated MC filter is as low as 1/16.

when two filters are used together, the requirements for terbium plating are higher. When there is a little light source in the picture, repeated reflections between two superimposed filters may cause more serious glare and fog. At this time, the possibility of interference caused by single-layer terbium-plated filter is about 1/8, while that of multi-layer terbium-plated filter is only 1/7.

B+W MRC multi-layer waterproof and antifouling terbium plating is not only a special and effective multi-layer terbium plating, but also has higher hardness than the glass itself, thus preventing the surface of the filter from being scratched. Waterproof and antifouling properties can also effectively keep the surface of the lens clean and maintain the optical properties of the lens for a long time.

B+W filter products are available in different models of single-layer terbium plating and MRC multi-layer terbium plating. Details can be found in the B+W lens parameter comparison table.

B+W lens connecting ring

When buying filter products, of course, the quality of lens glass and the technological level of terbium plating should be considered first. But please don't forget the workmanship of the lens connecting ring, which is also very important. The connecting ring of the lens must be strong enough to protect the fragile glass. It is best not to hold the filter in your hand often, and only remove it from the lens or store it properly in the filter box when necessary.

the thickness of the connecting ring should be just right, and the phenomenon of angle occlusion can't occur on a wide-angle lens. The printed font on the metal connecting ring should have a three-dimensional effect, so that it will not be worn after long-term use. The inner ring of the connecting ring must be anti-reflective to make it look like a non-reflective black surface. The connecting ring of B+W filter meets all the above requirements to achieve impeccable quality.

The filter adapter ring of B+W is made of durable brass on a precision CNC lathe. The latest B+W filter is made of light and strong space metal, which is more precise. In modern autofocus cameras, a lighter filter can undoubtedly reduce the burden on the lens driving motor. At present, the filter lens of B+W is fixed in the connecting ring by the threaded pressure ring, and the surface of the connecting ring is plated with chromium metal to further increase the durability, and the inside of the connecting ring is subjected to rigorous antireflection treatment.

The standard B+W filter adapter ring has been designed to be thin enough, so there will be no dark angle phenomenon on the general wide-angle lens. For ultra-wide-angle lenses with a particularly wide field of vision, you can choose a wide-angle special filter designed by B+W SLIM ultra-thin ring. Special filter interfaces for Hasselblad and Lulai, and special bayonet filter products are provided.

the function of color filter

the color filter will absorb the complementary color part of the external light and let the rest pass through. For example, if a yellow filter is used, the blue light will be basically absorbed and the remaining color light will be transmitted to produce yellow. The dark yellow filter with low transmittance not only absorbs blue light, but also absorbs a lot of other colored light. When shooting black-and-white film with a yellow filter, because the blue color is absorbed by the filter, the blue sky will appear very dark, and the tone of the sky will become low in the photo. The color filter installed in front of the lens will change the brightness and density ratio of incident light, so it may mislead the metering system and need corresponding exposure compensation.

optical requirements of filter technology

filters for photography directly participate in the process of light forming images. In order not to affect the quality of photos, they only indicate its absorption characteristics of light and cannot have any other optical effects. The surface of the filter must be absolutely flat (without any protrusions) and perfectly smooth (irregular surface will lead to scattering and soft focus). Only pure optical glass can meet the complete light transmission performance (ordinary glass will lead to blurred images), and the lens surface needs to not reflect light as much as possible (reflection will cause glare).

The most advanced production technology

Why do top photographers all over the world choose B+W filters? Because B+W has always been at the forefront of filter production technology, and has been a professional filter manufacturer for decades. Under the rich production experience, the unique technology of optical glass and anti-reflective terbium plating has been carefully brewed, which is not unrelated to the close cooperation promoted by Schott Glass. Continuous maintenance of advanced machine quality control provides a guarantee for manufacturing top-class products.