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UVC, UVB, UVA of Sunflower

UV Camera UV Lighting
3 replies to this topic

#1 dabateman

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Posted 10 December 2019 - 23:00

I found this to be an interesting series, which seems to be the reverse of what I typically see. It seems the petals get darker into higher UV (closer to 390nm) and lighter in deeper UV (Closer to UVC).

Visible reference image of the Sunflower:
Attached Image: Visible.jpg

All the below monochrome images are captured off the back of the KSS Imager with quartz 60mm lens, using a stock GM5 camera with Olympus 30mm f3.5 Macro lens.

UVC image of sunflower using single 250nm UVC light with just 253.7bp25 filter:
Attached Image: 253bp25.jpg

All the following images were captured using 2 ExoTerra UVB 26W bulbs. Since the Monochrome imager down converts the high UV energy to green light, it doesn't seem to pass 600nm+ light. So I don't need to use an IR blocker filter with my filters that leak IR.

303bp10 with 2mm U340 filter (seems to be the best to reduce the off axis dichroism):
Attached Image: 303bp10_U340.jpg

313bp25 filter (clear slide filter inserted):
Attached Image: 313bp25.jpg

335bp10 filter (clear slide filter inserted):
Attached Image: 335bp10.jpg

370bp15 filer (clear slide filter inserted):
Attached Image: 370bp15.jpg

390bp25 filter (clear slide filter inserted):
Attached Image: 390bp25.jpg

405bp10 filter (clear slide filter inserted):
Attached Image: 405bp10.jpg

#2 Andy Perrin

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Posted 11 December 2019 - 07:17

Another very interesting series, especially since this is one of our benchmark flowers. I would also like to see a dandelion when they return.

#3 dabateman

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Posted 11 December 2019 - 20:45

For fun here are some color mixed shots after alignment.

B for Blue, G for Green and R for Red channel

B253 G370 R390:
Attached Image: B253_G370_R390.jpg

B253 G303 R370:
Attached Image: B253_G303_R370.jpg

R253 G370 B390:
Attached Image: R253_G370_B390.jpg

B303 G370 R390:
Attached Image: B303_G370_R390.jpg

B303 G335 R405:
Attached Image: B303_G335_R405.jpg

#4 Mark

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Posted 12 December 2019 - 02:24

I like your "B303 G370 R390" mix - it plays up the contrasts in the subject without having to 'turn up' the contrast.