The MidOpt DB550_850-35.5 complements the DB660/850 and DB475/850 filters. When modifying a single color camera by removing its IR blocking filter, the incorporation of this filter in its place allows reflected near-infrared light (850nm) to be captured in the camera sensor’s red channel and reflected green light (550nm) to be captured in the sensor’s green channel (the blue channel is not used). Healthy vegetation will absorb (not reflect) green light and strongly reflect near-infrared light. Thus, this information can be used to apply a false-color gradient to images, better highlighting the contrast between healthy vegetation and areas with stressed, diseased, or no vegetation.There is a range of vegetation indices used by the remote sensing and precision agriculture community, and while NDVI is probably the most common, each have their advantages. Any of the indices listed below can be used when employing a single-color sensor camera that has been converted with a DB550/850 filter. Information gathered can then be overlaid on vegetation maps to inform better crop management decisions.Green Chlorophyll IndexCIg = (NIR / Green) – 1Green Difference Vegetation IndexGDVI = NIR – GreenGreen Normalised Difference Vegetation IndexGNDVI = (NIR – Green) / (NIR + Green)Green Ratio Vegetation IndexGRVI = NIR / GreenGreen Soil Adjusted Vegetation IndexGSAVI = [(NIR – Green) / (NIR + Green + 0.5)] * (1 + 0.5) All MidOpt filters can also be purchased unmounted or in custom dimensions upon request from Machine Vision Direct. Technical Specifications Specifications + Useful Range Min 535 nm Useful Range Max 565 nm Secondary Useful Range Min 830 nm Secondary Useful Range Max 870 nm FWHM 4050 nm Adhesive Backed Yes Tolerance 5 % Peak Transmission ≤ 85 % Surface Quality (Scratch-Dig) 40-20 Substrate Material Clear Glass Filter Diameter M35.5 x P0.5 Product Availability + Standard Lead Time 15 Days Stock Location Built to Order Product Lifecycle Active
