I have a filter that 'appears' to be the same colour as the Rosco 19 filter, on the Rosco website. How can I tell if it is the same colour?
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I don' t know what a "dedicated IR camera" is. You can use an appropriate red filter on a full spectrum camera to capture mostly NIR in the blue channel and mostly red in the red channel.
With an appropriate camera and filter, and with an appropriate calibration or custom white balance, NDVI values for healthy foliage in sunlight will be between 0.2 and 0.8 and NDVI values for non-foliage will be below 0.2.
I suppose 'dedicated IR camera' is not the best term. I simply have a DSCV1 and an F717, which are capable of 'normal colour photography, and infrared.
"You can use an appropriate red filter on a full spectrum camera to capture mostly NIR in the blue channel and mostly red in the red channel." So, are you saying that any colour camera (not converted to IR) is good for NIR by placing the Rosco 19 filter in front of the lens?
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A full spectrum camera is one that has been converted to capture NIR by removing the IR cut filter. This filter which is present in all standard cameras blocks NIR so must be removed before the camera can be used to capture NIR.
The basics of this process are described here: https://publiclab.org/wiki/ndvi-plots-ir-kit
Ah, I misunderstood the term 'full spectrum'. Now I get what your saying. So, a full spectrum camera does not have visible light block filter. That explains a lot.
Thanks again for your help, and patience.