DB660-850-77 Red and 850nm NIR Dual Bandpass Filter M77x0.75

Midwest Optical SystemsSKU: DB660-850-77

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Sale price$653.00 USD

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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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