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UltravioletPhotography

UVC, UVB, UVA of Sunflower


dabateman

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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:

post-188-0-02941100-1576018671.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:

post-188-0-61649500-1576018688.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):

post-188-0-75726700-1576018700.jpg

 

313bp25 filter (clear slide filter inserted):

post-188-0-23667100-1576018715.jpg

 

335bp10 filter (clear slide filter inserted):

post-188-0-56297500-1576018731.jpg

 

370bp15 filer (clear slide filter inserted):

post-188-0-18675900-1576018743.jpg

 

390bp25 filter (clear slide filter inserted):

post-188-0-25998800-1576018803.jpg

 

405bp10 filter (clear slide filter inserted):

post-188-0-62930200-1576018815.jpg

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Another very interesting series, especially since this is one of our benchmark flowers. I would also like to see a dandelion when they return.
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For fun here are some color mixed shots after alignment.

 

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

 

B253 G370 R390:

post-188-0-97163300-1576097039.jpg

 

B253 G303 R370:

post-188-0-01988600-1576097059.jpg

 

R253 G370 B390:

post-188-0-25071400-1576097097.jpg

 

B303 G370 R390:

post-188-0-54397000-1576097116.jpg

 

B303 G335 R405:

post-188-0-08080300-1576097131.jpg

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