This B&W 40.5mm 093 (87C) Infrared Glass Filter blocks the entire visible spectrum, so to our eyes it looks completely opaque. Unlike the B&W 092 infrared filter, it 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, 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

• In the scientific field, materials research and forensics, the limitation to a strictly infrared range is often important.