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NanoMeter Silver Member Nikonian since 17th May 2012
Tue 17-Sep-13 05:10 AM | edited Sun 08-Sep-13 09:05 PM by NanoMeter

Here is a swapped version of a Schott UG5 stack.
This UG5 stack is a mix of UV, Blue, and Green. UG5 is stacked with S8612 to suppress the IR portion of the UG5 transmission.
UV is less abundant than visual and IR, and the camera sensor is less sensitive to UV, so the higher transmission amplitude of the UV works well in balance with the lower transmission amplitude of the Blue and Green portion of this transmission curve.

This is the same idea as swapped 'false color' 590nm IR ("Super Color"),
except this is the 'other end of the rainbow'.
So instead of pure UV (or pure IR), we mix the UV (or IR) with some portion of visual. In the case of 590nm IR we mix the IR with some red light. In this case we are mixing the UV with some blue/green light.

Note: This variety of Rudbeckia has no pattern in visual or IR, so the red/lavender pattern visible in this UV/B/G photo is not seen without including the UV portion of the spectrum.
I have included IR and visual examples of Rudbeckia to illustrate this point.
(some Rudbeckia varieties do have a visual pattern)

UG5 Stack

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Rudbeckia 720nm IR
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Rudbeckia (what we see visually)
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Multiple swap tests from two UG5 stacks
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