With a light intensity reduction of ten f-stops, this B+W Neutral Density Filter has a slightly stronger warm tone than the ND 6 stop filter. Its principal field of application is the observation & documentation of industrial processes with extreme brightness, such as steel furnaces, incinerators, glowing filaments in halogen- & other bulbs. However, it is being increasingly used in artistic photography to blur motion or render moving elements invisible. The filter factor is 1000x. ...

The B+W 52mm Black (093) Infrared Filter blocks the entire visible spectrum, so to our eyes it looks completely opaque. Iit makes pure infrared photographs possible without the visible red component. Its transmission only begins to exceed 1% at 800 nm, rising to 88% at 900 nm, & remains that high far beyond the upper limit of sensitisation covered by infrared films. This filter is used less frequently in pictorial photography because of the dramatic loss of effective ISO. But in the scientific field, materials research & forensics, the limitation to a strictly infrared range is often important. The filter factor is very dependent on the illumination & on the characteristics of the film. ...

The B+W Circular Polariser XS-PRO Digital Filter increases colour saturation & reduces reflections. Circular polarizing filters are made for all cameras with beam splitters in the light paths of their TTL exposure meter & with autofocus lenses. Circular polarization has the same pictorial effect as linear polarization, but allows for proper exposure metering and/or autofocus distance settings. ...

The B+W Clear Glass XS-PRO Digital Filter fulfils the desire of many photographers for pure lens protection without a filter effect. Its only function is to keep dirt, s&, or splashes away from the front lens. The extremely clear special glass with high transmission is MRC-finished. ...

The B+W 52mm Clear UV Haze (010) Filter blocks the invisible UV component of light from the sky, which can cause blur & a blue cast. UV Filters are ideal for photography in high altitudes (in the mountains), by the sea & in regions with very clean air. Because the glass is colourless, colour rendition is not altered, aside from the elimination of the unwanted blue cast, & no increase in exposure is required. That makes a UV Filter very suitable as protection of the front element of the taking lens against dust, s&, sea water spray & the like, & it can be kept on the lens at all times. ...

The B+W 52mm NL 2 Close Up HS Filter focuses at a distance of 0.5m (1 5/8 feet) with the lens focused at infinity. For the normal lens it is a stepless extension of its close-up range up to Approx. 1:4.5. On short to medium telephoto lenses it extends the NL 1 close-up range seamlessly (with an 85mm lens to Approx. 1:3.5 & with a 135mm lens to Approx. 1:2.5). ...

The B+W 52mm Close-Up +3 (NL3) Filter provides a near-focusing distance that begins at 33cm (13 inches) from the front rim, regardless of the focal length of the main lens. When close-ups have to be taken because of the wide-angle effect of a 35mm lens, the NL 3 close-up lens is ideal for a seamless extension of the normal close-up range up to Approx. 1:5.5. ...

The B+W 52mm Close-Up +4 (NL4) Filter is the right power for closer focusing with a 50mm lens (up to Approx. 1:3) when you have reached the limit with the NL 2 lens. With 85mm (up to Approx. 1:2.1) & 100mm (up to Approx. 1:1.9) telephoto lenses, it is the highest power, & it should be used with the main lens stopped down to at least f/8. ...

The B+W 52mm Dark Red (091) Filter even darkens the reds near the yellow tones in the spectrum, as its transparency only begins in the orange-red region. It produces dramatic effects & extreme tonal separation for graphic effects & high contrast. That accounts for the large filter factor of appr. 8. ...

The B+W 52mm F-Pro 415 UV Filter is a nearly colourless B+W filter that is designed to cut out UV radiation up to the limit of visible light. It is used in ultraviolet fluorescence photography for the prevention of unsharpness caused by the intense UV illumination (which is due to chromatic aberration in the UV range). It can also stop the fluorescence that may occur in the cement between lens elements. ...