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Chrysanthemum or Dahlia (vis, UV, SWIR 1500-1600nm, UVIVF)

Fluorescence Multispectral SWIR
3 replies to this topic

#1 Andy Perrin

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Posted 10 August 2019 - 23:35

This is either a chrysanthemum or dahlia, I think, and I forgot to get pics of the leaves again, so it will have to wait a while. Anyway, it's a pretty yellow flower.

Visible (Resolve 60mm lens, forgot to note exposure, converted Sony A7S camera, and an S8612 1.75mm+DB850 dual band filter for visible)
Attached Image: Chrysanthemum vis UVP.jpg

UV (Resolve 60mm lens, F/16, 20", ISO1000, converted Sony A7S camera, and 330WB80 filter)
Attached Image: Chrysanthemum UV UVP.jpg

UVIVF (Noflexar 35mm/3.5, F/11 30" ISO3200, converted Sony A7S camera, and an S8612 1.75mm+DB850 dual band filter for visible)
With Convoy S2+ torch.
Attached Image: YF UVIVF UVP.jpg

SWIR 1500-1600nm (Wollensak 25mm lens, no idea how to note exposure, TriWave Ge-CMOS camera, and Thorlabs 1500nm long pass filter)
This is a pano with the size reduced to increase quality.
Attached Image: YF SWIR pano_res.jpg

#2 dabateman

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Posted 11 August 2019 - 05:05

"Pretty yellow flower"
I like that description, sounds like my botany level.
The UV is nice, the detail in the petals is great. The SWIR, is the first I think it looks like regular old IR.
Great comparison.
Did you also take an IR chrome like image? In the one flower series you did that, I liked it and thought I need to mix up my shots more.

#3 Andy Perrin

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Posted 11 August 2019 - 05:06

Sometimes I do. I’m not the type who standardizes everything. I just take whatever photos strike my fancy. Yeah, a number of the SWIR are similar to the NIR. You never know ahead, though.

Edited by Andy Perrin, 11 August 2019 - 05:13.


#4 Andrea B.

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Posted 13 August 2019 - 22:29

I would suggest Dahlia only because it seems a bit early for Chrysanthemums. But I really do not know for sure.

Dahlias have several "types" which dahlia breeders support. One of them, the decorative dahlia, is very chrysanthemum like.

The fine striping on the petals is wonderful! It's funny that after all these years making photos of botanical UV-signatures, I can still be so very pleased when I see a new (to me) UV-signature such as from your yellow flower above. The variety of UV-signatures never ceases to amaze me.
Andrea G. Blum
Often found hanging out with flowers & bees.