After playing with one camera that had an infrared range that went into the visible (orange -> deep IR) and one that only did deep infrared, I thought I should convert one to a wider range of infrared, but one that was entirely invisible to the human eye.
This is what the Minnehaha Falls look like when you can’t look at them.
Two odd things about infrared cameras:
1) Even thought blue is well outside of the IR range, some things that are blue to the human eye get picked up as blue by the converted camera. I did some testing and I’m pretty sure that this is how this particular camera sees deep infrared. I have no idea why visible blue also reflects as deep IR, but it does.
2) Some lenses have hotspots, where the infrared light hits the sensor and bounces off to hit the rear of one of the elements of the lens (somewhere in front of the aperture) and bounces back to get detected again. In the final image, this shows up as a ghostly light, usually in the center of the frame. This effect usually just shows strongly up at certain aperture settings.
In this case, both effects worked to my advantage.
Even though the new camera can see “colour” in infrared, I still prefer the high-contrast black and white look. As a bonus, it can make innocuous things, like this new coloured pencil fence, look kinda old and creepy.
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