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Rudbeckia (Vis, UV, UVIVF, IRG, 1500-1600nm SWIR)

Fluorescence Infrared Multispectral SWIR
4 replies to this topic

#1 Andy Perrin

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Posted 18 July 2019 - 19:18

Same settings and equipment as the other flowers in this series, with exceptions noted below.

UV
2mm UG11 + 1.75mm S8612 (Convoy S2+)
Saturation strongly increased
Attached Image: _DSC2561 UV UVP.jpg

Visible
BG38 2mm and DB850 filter (645-405nm)
Attached Image: _DSC2565 vis UVP.jpg

NIR-Red-Green (550-645nm + 835-875nm)
Tiffen#12 + DB850 filter, and my usual algorithm for making the IRG, described in the DB850 filter thread
Attached Image: _DSC2567 aerochrome UVP.jpg

NIR
Hoya R72 + DB850 filter (835-875nm)
Attached Image: _DSC2568 IR850 UVP.jpg

SWIR
(1500-1600nm, made by the panorama method and reduced for higher resolution)
Attached Image: black-eyed susan SWIR pano small_res UVP.jpg

UVIVF under Convoy S2+ and using BG38 2mm and DB850 filters
Attached Image: _DSC2566 UVIVF UVP.jpg

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Comments:
The SWIR looks a lot like the visible but with a lighter disk in this one, enough that I got scared and decided to check if my filter was leaking. However when I stacked it with my hard-coated premium Thorlabs 1200nm long pass (guaranteed >OD5), it looked the same, so I guess it just looks similar by coincidence. If you look at the bottom left of the flower, there is a tiny splash of water on a petal, so you can see that the water, although dark, isn't inky when it's just a thin layer like that.

This morning the disk florets had started to open up, and they are white in the SWIR 1500-1600nm band:
Attached Image: Disk flowers_res.jpg

Edited by Andy Perrin, 18 July 2019 - 19:26.


#2 Cadmium

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Posted 19 July 2019 - 02:19

Andi, I especially like the Tiffen #12 + DB850 stack flower, and also the UVIVF.

#3 dabateman

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Posted 19 July 2019 - 04:51

Great flower images.
You have much less dust than I do. That is what I seem to see in my UVIVF images. Maybe thats why I prefer UVIIRF, skips my dust.

#4 Cadmium

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Posted 19 July 2019 - 07:52

Andy, What illumination for the Tiffen #12 + DB850 stack shot?

#5 Andy Perrin

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Posted 19 July 2019 - 13:34

Halogen