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Description
MidOpt DB660-850-77 Red and 850nm NIR Dual Bandpass Filter
The DB660/850 filter has been designed primarily for NDVI imaging applications. When using a single camera, the incorporation of this filter allows reflected red light (660nm) to be captured in the camera sensor’s red channel and reflected near-infrared light (850nm) to be captured in the sensor’s blue channel (the green channel is not used). Even when using an inexpensive consumer camera (that has first had its IR blocking filter removed), this easy separation then makes it possible to post-process the red and blue channels for NDVI by performing the calculation: NDVI = (blue – red) / (blue + red). Healthy vegetation will absorb (not reflect) red light and strongly reflect near-infrared light. Thus, this information can apply a false color gradient to images to better highlight the contrast between regions of healthy vegetation vs. areas with stressed/diseased or no vegetation.MidOpt DB660-850-77 Technical Specifications:
Product Line / Series | DB - Dual Bandpass |
Filter Model | DB660/850 |
Filter Type | Red and 850nm NIR Dual Bandpass |
StablEDGE | No |
Useful Range | 645nm - 675nm / 830nm - 870nm |
Tolerance | +/- 5nm |
Peak Transmission | ≥90% |
Surface Quality | 40/20 |
Filter Size | 77mm |
Filter Thread | M77x0.75 |
Outer Diameter | 85mm |
Clear Aperture | 76.8mm |
Overall Thickness | 6.5mm |
Exposed Thickness | 4.5mm |
FWHM | 40nm/50nm |
Average Transmission | Not Specified |
Brand | Midwest Optical Systems |
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