Tag Archives: IR

Doing Interval Photography with a Sigma SD14

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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A Human Powered IR Detector

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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Easy-Simple IR Detector

Figure 1:  A very simple, cheeeep, IR detector for hobby photography

Posted 06-08-2018

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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