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Filter—B+W 489 Infrared Cut
Spectral transmission graphs on this page were measured by Coastal Optical Systems on their equipment using single samples of the specified filters. Graphs used by permission.
Graphs are in nanometers. Visible light is approximately 390 - 650 nm (the human eye can see very weakly into the 700-800nm range).
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No so effective at blocking infrared, with a very gradual “tail” well into the infrared range, passing nearly 50% infrared at 700nm.
This leakage is enough infrared to cause a red shift on IR-sensitive cameras like the Nikon D2H. It also passes shorter wave ultraviolet almost unimpeded.