Day/Night 940/850 Narrowband Filter
Day/night 940/850 narrowband filters are optical components used in security surveillance to optimize imaging under different lighting conditions. Their optical-filtering principle selectively transmits particular wavelengths while blocking interference from other wavelengths. Under nighttime infrared illumination, for example, the filter passes 850nm or 940nm infrared light to improve image quality; during the day, it filters infrared light to maintain clear visible-light imaging. These filtering characteristics and day/night capability support high-quality imaging in both ordinary surveillance and special-environment applications.
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