Details
MidOpt DB550-850-37.5 Green and 850nm NIR Dual Bandpass Filter
The DB550/850 compliments the DB660/850 and DB475/850 filters. When modifying a single color camera by removing its IR blocking filter, incorporation of this filter in its place allows reflected near-infrared light (850nm) to be captured in the camera sensors red channel and reflected green light (550nm) to be captured in the sensors 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 then be used to apply a false color gradient to images to highlight better the contrast between regions of healthy vegetation vs. areas with stressed, diseased, or no vegetation.
There is a range of vegetation indices used by the remote sensing and precision agriculture community. While NDVI is probably the most common, each has its advantages. Any indices listed below can be considered when employing a single color sensor camera converted using a DB550/850 filter. Information gathered can then be overlaid on vegetation maps to provide information used to make better crop management decisions.
MidOpt DB550-850-37.5 Technical Specifications:
| Product Line / Series | DB - Dual Bandpass |
| Filter Model | DB550/850 |
| Filter Type | Green and 850nm NIR Dual Bandpass |
| StablEDGE | No |
| Useful Range | 535nm - 565nm / 830nm - 870nm |
| Tolerance | +/- 5nm |
| Peak Transmission | 85% |
| Surface Quality | 40/20 |
| Filter Size | 37.5mm |
| Filter Thread | M37.5x0.5 |
| Outer Diameter | 41mm |
| Clear Aperture | 34mm |
| Overall Thickness | 7mm |
| Exposed Thickness | 5.2mm |
| FWHM | 40nm/50nm |
| Compatible LED | 548nm, 840nm, 850nm |
| Average Transmission | Not Specified |
| Brand | Midwest Optical Systems |
