DB395_870-67 | DB395/870 Dual Bandpass Absorptive Visible + NIR

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The MidOpt DB395_870-67 dual bandpass filter passes UV-Violet and infrared wavelengths, effectively blocking all green and red light. These filters have traditionally found use in NDVI-type imaging applications. When using a single camera modified for aerial agricultural surveillance, incorporation of these so-called “Superblue” or “Infrablue” filters allows reflected near-infrared light (745-970nm) to be captured in the camera sensor’s red channel and reflected violet light (375-425nm) to be captured in the sensor’s blue channel (the green channel is not used). Even with an inexpensive consumer camera (that has had its IR-blocking filter removed), this easy separation makes it possible to post-process the red and blue channels for NDVI by performing the calculation: NDVI = (red – blue) / (red + blue). Healthy vegetation will absorb (not reflect) blue light and strongly reflect near-infrared light. While “Superblue” filters similar to DB395/870 have seen much use in recent years, for better wavelength separation and contrast, we strongly recommend our newer DB475/850 or DB660/850 dualband filters instead. All MidOpt filters can also be purchased unmounted or in custom dimensions upon request from Machine Vision Direct. Technical Specifications Specifications + Useful Range Min 375 nm Useful Range Max 745 nm Secondary Useful Range Min 425 nm Secondary Useful Range Max 970 nm FWHM 110375 nm Adhesive Backed Yes Tolerance 10 % Peak Transmission ≤ 90 % Surface Quality (Scratch-Dig) 40-20 Substrate Material Colored Glass Filter Diameter M67 x P0.75 Product Availability + Standard Lead Time 15 Days Stock Location Built to Order Product Lifecycle Active Show more