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| Infrared filters
Infrared filters transmit IR radiation, but block visible light either completely or largely. The black B+W Infrared filter 093 allows pure IR photos in scientific or technical applications (e.g. material research, forensic investigation, criminology). The B+W filter 092 is the most popular filter for IR black and white photos. It is black and only purple against light sources. It provides an infrared image with a red portion for the better utilization of the low sensitivity of infrared films. The B+W filter 099 transmits a little yellow and a lot of orange and red and is so ideal for the IR color film known as false-color film.
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B+W Infrared Filter 093 (=87 C)
This B+W Infrared Filter blocks the entire visible spectrum, so to our eyes it looks completely opaque. Unlike the infrared filter described above, it makes pure infrared photographs possible without the visible red component. Its transmission only begins to exceed 1% at 800nm, rising to 88% at 900nm, and remains that high far beyond the upper limit of sensitization 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 and forensics , the limitation to a strictly infrared range is often important. The filter factor is very dependent on the illumination and on the characteristics of the film.
B+W Infrared Filter 092 (=89 B)
The nearly opaque B+W Infrared Filter 092 , which looks dark purplish red when held in front of a light source, blocks visible light up to 650nm, and passes only 50% of the radiation just below 700nm(thus the dark red color). From 730nm to 2000nm, transmission is greater than 90%. This makes photographs of pure red and infrared images possible with the best utilization of the relatively low sensitivity of infrared films. As the sensitization of infrared black-and-white films barely extends beyond 1000mm, the red portion that is transmitted still makes a relevant contribution to the exposure. That is why this filter is the preferred filter for pictorial photography on IR black-and-white film. Its filter factor is 20 to 40.
B+W Infrared Filter 099
The orange-colored B+W Infrared Filter 099 is the ideal filter for photography with infrared color film, which is also referred to as " False Color Film" because of its charming abstract color reproduction. It blocks large portions of short-wave radiation , up to 520nm(blue, blue-green) and reaches its full transmission near 600nm, which it retains far beyond the sensitization range of these films. This avoids the blue cast that is caused by the heightened sensitivity in this spectral range, and it leads to a better differentiation of colors. The charm of these infrared color photographs is partly due to the orange to red rendition of green vegetation, which is due in turn to the high infrared reflectivity of the chlorophyll in plants. The filter factor is highly dependent on the film and on the degree of infrared reflection of the subject.
- Check more B+W Filters Introduction:
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