DB475-850-77 Blue and 850nm NIR Dual Bandpass Filter M77x0.75

Midwest Optical SystemsSKU: DB475-850-77

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Precio de venta$653.00 USD

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MidOpt DB475-850-77 Blue and 850nm NIR Dual Bandpass Filter

The DB475/850 Dual Bandpass Filter has been primarily designed for NDVI imaging applications. When using a single camera, the incorporation of this filter allows reflected near-infrared light (850nm) to be captured in the camera sensor’s red channel and reflected blue light (475nm) 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 = (red-blue) / (red + blue). Healthy vegetation will absorb (not reflect) blue 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.

MidOpt DB475-850-77 Technical Specifications:

Product Line / Series DB - Dual Bandpass
Filter Model DB475/850
Filter Type Blue and 850nm NIR Dual Bandpass
StablEDGE No
Useful Range 460nm - 490nm / 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 45nm/60nm
Average Transmission Not Specified
Brand Midwest Optical Systems

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