Not all infrared or Hot Mirror filters are made the same, and not all work the same way on different cameras. The visible spectrum runs from approximately nanometers to nanometers in wavelength. Most cameras are built with a Hot Mirror filter mounted to the front of the sensor, but some Hot Mirrors are better than others. Neutral density filters block visible light but not far red or infrared, so adding ND filters reduces the ratio of visible light to far red light hitting the sensor. At some point that ratio becomes low enough that far red becomes visible and is easily seen in reflective synthetic materials and some clothing dyes, which makes those materials appear a muddy maroon or, in some cases, bright blue. Believe it or not, the bright blue in the black jacket on the left of frame is IR contamination.
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Signal Mirror with holographic sighting
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