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B+W's 37mm IR Black #093 Filter blocks the entire visible spectrum and so to our eyes looks completely opaque. It makes pure infrared photography possible by eliminating the visible red component. Its transmission only begins to exceed 1% at 800 nm, rising to 88% at 900 nm, 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 in the range of 20 to 40 but largely dependent on the illumination present and on the characteristics of IR film.
This filter uses the standard B+W F-Pro filter mount, which has a front accessory thread and is made of brass. Compared to the earlier standard mount introduced in 2001, the F-Pro mount has become thinner. Now it can be used with wide angle lenses, including most 24mm focal lengths on a full frame body, without vignetting. Another advantage of the F-Pro mount is it's modified retaining ring, which is no longer threaded in from the front, but holds the filter glass in place from the back. When removing a filter or lens hood that has been screwed on too tight to the filter, the retaining ring is not at risk of loosening.