Figure 1: Homemade “DIY” power adapter for Sigma SD14
I really have come to appreciate the Sigma SD14 camera that I’ve been using for over a month or so, applying it for IR photography. It really shines there, due to the Foveon class sensor that outdistances most competitors in terms of IR sensitivity. I have captured time-lapse photos that I believe contain as low as 1.5 microns (high mid-infrared) wavelength light. This is ordinarily not possible with the standard Bayer sensor in most camera brands, based on the info (veracity unknown) – that I’ve come across in my internet meanderings.
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Figure 1: A low pass (visible light blocking) filter, that allows infrared to pass thru it unblocked.
Normally, IR is invisible to the human eye. So, how could a person detect infrared radiation with the eye? It can be done indirectly. In figure 1 is the low pass visible light blocking filter known to all IR photographers. It blocks visible light (notice that it is jet black, even when held in front of a bright lamp).
The thing is, the human eye can detect IR already. It can detect even down to the level of upper level “far” IR!
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Figure 1: A very simple, cheeeep, IR detector for hobby photography
A lot of hobby photographers are using IR cameras, or retrofitting common cameras to do IR photography. If the camera is a retrofit, then the photo hobbyist may not know the level of IR before a shot is taken.
This easy junk box build is a way to discover at least a ball-park guestimate of how much IR is present before a shot is taken.
The nice thing about this detector is that it uses a photodiode that reaches all the way down to 1.7 um (micro-meters) in the Near IR / Mid IR boundary area. Some newer cameras may be able to take photographs in that band.
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