Author Topic: UV-Nikkor 105mm does Bidens in VIS-UV  (Read 262 times)

Dr Klaus Schmitt

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UV-Nikkor 105mm does Bidens in VIS-UV
« on: June 04, 2021, 11:17:20 »
Amazing that dark "bullseye" UV-pattern bees and butterflies can see as a landing platform, but we humans cannot...

Shot using a UV-Nikkor 105mm at f11 on a full-specrum modified Panansonic GH4 using a modified studio flash.


There have been scientific experiments done (Prof. em. Klaus Lunau, Düsseldorf, Germany) which prove that bees

land on a flower petal and then always crawl to find the UV-dark part to find nectar and pollen (they artifically reversed

the petals and the bees then crawled to the outside and not to the center anymore)!

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Birna Rørslett

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Re: UV-Nikkor 105mm does Bidens in VIS-UV
« Reply #1 on: June 04, 2021, 12:10:49 »
Interesting. Do you have a link to a published paper on this?

Akira

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Re: UV-Nikkor 105mm does Bidens in VIS-UV
« Reply #2 on: June 04, 2021, 23:10:24 »
Great find!  I would also like to read the paper.
"The eye is blind if the mind is absent." - Confucius

"Limitation is inspiration." - Akira

Dr Klaus Schmitt

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Re: UV-Nikkor 105mm does Bidens in VIS-UV
« Reply #3 on: June 05, 2021, 14:20:33 »
It should be this one:
https://www.researchgate.net/publication/272525060_Bees_birds_and_yellow_flowers_Pollinator-dependent_convergent_evolution_of_UV-patterns/link/5b5974e2aca272a2d66bb56d/download

The there is this one on "false UV color photography" where I have provided technical assistance to:
https://www.researchgate.net/publication/326318630_FALSE-COLOUR_PHOTOGRAPHY_A_NOVEL_DIGITAL_APPROACH_TO_VISUALIZE_THE_BEE_VIEW_OF_FLOWERS

PS: Klaus and I disagree a bit on that latter mapping method, as his method leads to extinguish UV patterns, whereas I have developed (unpublished) a method which preserves these UV patterns. We still communicate often... ;-)

Example:



Source: https://www.researchgate.net/publication/340940804_Nectar_mimicry_a_new_phenomenon
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Birna Rørslett

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Re: UV-Nikkor 105mm does Bidens in VIS-UV
« Reply #4 on: June 05, 2021, 14:39:43 »
Thanks, Klaus. I downloaded both pfds and will study them at my leisure.

bobfriedman

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Re: UV-Nikkor 105mm does Bidens in VIS-UV
« Reply #5 on: June 05, 2021, 14:47:18 »
quite nice info Klaus.. and like the animation.
Robert L Friedman, Massachusetts, USA
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Nasos Kosmas

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Re: UV-Nikkor 105mm does Bidens in VIS-UV
« Reply #6 on: June 05, 2021, 15:07:54 »
Perfect example of liquid chromatography here, very interesting thank you!

Akira

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Re: UV-Nikkor 105mm does Bidens in VIS-UV
« Reply #7 on: June 05, 2021, 16:51:32 »
Thank you, Klaus!  I also downloaded both PDFs!
"The eye is blind if the mind is absent." - Confucius

"Limitation is inspiration." - Akira

Dr Klaus Schmitt

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Re: UV-Nikkor 105mm does Bidens in VIS-UV
« Reply #8 on: June 07, 2021, 08:41:02 »
Thank you and most welcome guys!
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