The infrared spectrum is above 700nm. The Infrared filter blocks all the light below 700nm. This photo was taken with my spectrometer and the camera was in the night shot mode. It wasn't designed to have a camera mounted to it so it was a little difficult to get this shot, but you can see the infrared wavelengths with a Fraunhofer Absobtion line around 800nm. These lines show up when something blocks a particular wavelength (probably the California smog)
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