B+W Filter Quality Made in Germany
When manufacturing our many different B+W filter types, only the finest quality sanded and fine-polished optical filter glass is used. The result is homogeneous, plane-parallel, streak-and bubble-free filter glass for the highest photographic demands.
B+W PROTECTION FILTERS
Active photography puts a great demand on both cameras and lenses. It makes sense therefore to use a B+W filter to protect your delicate front lens element against the elements such as blowing sand and dust, fingerprints and splashing water. B+W filters not only cost just a fraction of the price of a new lens but they are also easier to clean. They can remain in front of the lens permanently as they are absolutely color-neutral, highly transparent and, thanks to the B+W MRC coating or B+W MRC nano-coating, have an extremely low reflection. The optical information remains unaffected when it reaches the image sensor (or film). With these extremely clear and highly transparent B+W protection filters, no exposure compensation factor needs to be taken into account.
Protection filters play a particularly important role in digital photography. The larger depth of field resulting from smaller image sensors increases the effects on image quality from front lens soiling. Fingerprints, for instance, reduce sharpness significantly, particularly in the case of zoom lenses with a lower light intensity and frequent cleaning of the front lens can not only cause scratching, but also transport dirt particles or moisture at the edge of the mount to the inside of the lens system.
B+W 010 UV HAZE FILTER
The classic amongst the B+W protection filters blocks the annoying UV component of daylight. Invisible UV light is more intense in pure sea air and in high mountain regions and can cause blurring and a blueish cast. The color-neutral B+W 010 UV haze filter is equally suitable for both analog and digital cameras. It ensures more brilliant images and can remain on the lens permanently as front lens protection.
• Color-neutral filter glass
• Blocks annoying UV components of daylight
• No multiplying factor
• Made in Germany
B+W COATING SYSTEMS
High-performance Photographic Filters
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.
B+W MULTI-RESISTANT COATING MRC
Both sides of B+W MRC coated filters have a multi-layer coating. It consists of 7 + 1 layers, of which 7, also called the MC layers, guarantee high transmittance and maximum elimination of reflections by minimising reflection losses. Instead of the usual 4% reflection losses at the glass surface, the MC layer reduces this value to an average of well below 0.5%. This enables brighter colors and higher contrast to be achieved. The reflection curve of the MC layer shows the more accurate values over the entire visible spectrum.
Because the sensor in the camera always reflects back a portion of the incident light, depending on the shooting situation, ghost or double images may be produced. This effect is greatly minimised by using MRC filters with an anti-reflective coating on both sides and, depending on the shooting situation, can be completely eliminated.
The last, outermost layer, which is represented by the R = Resistant in the name B+W MRC, serves a different purpose. It provides the dirt- and water-repellent surface of the B+W MRC coating, thus making it considerably easier to clean.
he coating material consists of special substrates that are applied in one or more layers depending on the coating system.
B+W FILTER MOUNTS
Precision with no Rough Edges
An important element in a perfect B+W filter is a high-precision filter mount. It must be easy to hold, easy to screw on and off the lens, and fit exactly. The filter glass is perfectly plane and is screwed securely in place. It fits without play and tension. B+W filter mounts are closely toleranced and have very small dimensions. Even with the standard F-Pro mount on wide-angle lenses, photos without vignetting are possible.
B+W PROFESSIONAL LINE
B+W F-Pro Standard Mount
B+W F-Pro standard filter mounts have a high mechanical stability despite their small mounting height. They can be used on most of the popular wide-angle lenses without any risk of vignetting. It is not possible to give exact information on focal lengths or the aperture-angle limit, however, as vignetting depends not only on the filter mounting height and aperture angle, but also on the design of the lens barrel. As a guide for use with zero risk of vignetting, 35 mm with DSLR format is a good rule (approx. 63° diagonal aperture angle). In addition, most wide-angle lenses with 28 mm (about 75° aperture angle), and even many with 24 mm (approx. 84° aperture angle), can be combined with the B+W F-Pro standard mount without risk of vignetting. The same aperture angles apply to the lenses of the respective digital cameras. Despite the smaller mounting height, additional filters, snap caps, or lens hoods can be attached easily and securely in the full front thread.