A DB940 filter passes visible and 940 nm LED or laser diode illumination. 940 nm LEDs do not emit the faint red glow associated with 850 nm and other lower near-IR LED wavelengths. Using a DB940 filter over or behind the lens allows full color imaging during the day and covert surveillance at night. However any cameras spectral response at 940 nm will be lower than at other, shorter near-IR wavelengths, so relative sensitivity of each cameras imaging sensor at 940 nm must also be considered.
- Useful Range: 405 to 650 nm, 925 to 965 nm
- FWHM: 250 nm, 50 nm
- Tolerance: +/- 20nm VIS, +/- 10nm NIR
- Minimum Peak Transmission: >90%
- Surface Quality: 40/20
- Compatible LED: 940 nm, 950 nm