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UltravioletPhotography

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


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Andy Perrin

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

post-94-0-66146000-1563477474.jpg

 

Visible

BG38 2mm and DB850 filter (645-405nm)

post-94-0-73058800-1563476595.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

post-94-0-01952500-1563476767.jpg

 

NIR

Hoya R72 + DB850 filter (835-875nm)

post-94-0-70054600-1563477130.jpg

 

SWIR

(1500-1600nm, made by the panorama method and reduced for higher resolution)

post-94-0-84164900-1563477338.jpg

 

UVIVF under Convoy S2+ and using BG38 2mm and DB850 filters

post-94-0-02317200-1563477493.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:

post-94-0-39401400-1563477898.jpg

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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.

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  • 2 years later...

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