NikonGear'23

Gear Talk => Lens Talk => Topic started by: Dr Klaus Schmitt on June 04, 2021, 11:17:20

Title: UV-Nikkor 105mm does Bidens in VIS-UV
Post by: Dr Klaus Schmitt 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)!

(https://a4.pbase.com/o12/08/747708/1/171688490.WsjrL97c.BidensVISUV2k.gif)

Title: Re: UV-Nikkor 105mm does Bidens in VIS-UV
Post by: Birna Rørslett on June 04, 2021, 12:10:49

Interesting. Do you have a link to a published paper on this?

Title: Re: UV-Nikkor 105mm does Bidens in VIS-UV
Post by: Akira on June 04, 2021, 23:10:24

Great find!  I would also like to read the paper.

Title: Re: UV-Nikkor 105mm does Bidens in VIS-UV
Post by: Dr Klaus Schmitt 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 (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 (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disagree a bit on that latter mapping method, as his method leads to extinguish UV patterns, whereas I have developed (unpublished) a method which preserves these UV patterns.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:

(https://www.researchgate.net/profile/Klaus-Lunau/publication/340940804/figure/fig2/AS:884878438592512@1587982868450/Colour-photo-left-UV-photo-middle-and-false-colour-photo-in-bee-view-right-of.jpg)

Source: https://www.researchgate.net/publication/340940804_Nectar_mimicry_a_new_phenomenon (https://www.researchgate.net/publication/340940804_Nectar_mimicry_a_new_phenomenon)

Title: Re: UV-Nikkor 105mm does Bidens in VIS-UV
Post by: Birna Rørslett on June 05, 2021, 14:39:43

Thanks, Klaus. I downloaded both pfds and will study them at my leisure.

Title: Re: UV-Nikkor 105mm does Bidens in VIS-UV
Post by: bobfriedman on June 05, 2021, 14:47:18

quite nice info Klaus.. and like the animation.

Title: Re: UV-Nikkor 105mm does Bidens in VIS-UV
Post by: Nasos Kosmas on June 05, 2021, 15:07:54

Perfect example of liquid chromatography here, very interesting thank you!

Title: Re: UV-Nikkor 105mm does Bidens in VIS-UV
Post by: Akira on June 05, 2021, 16:51:32

Thank you, Klaus!  I also downloaded both PDFs!

Title: Re: UV-Nikkor 105mm does Bidens in VIS-UV
Post by: Dr Klaus Schmitt on June 07, 2021, 08:41:02

Thank you and most welcome guys!

Title: Re: UV-Nikkor 105mm does Bidens in VIS-UV
Post by: Wannabebetter on August 09, 2021, 22:05:41

Thank you, Dr. Schmitt! You and this website never disappoints. What an education...hopefully I will retain much of it, too!

Title: Re: UV-Nikkor 105mm does Bidens in VIS-UV
Post by: rosko on August 13, 2021, 13:40:01

Thanks, Dr Klaus!

Very interesting scientific fact.

Your demonstration is amazing, thanks this field (UV IR)of photography.


Francis.

Title: Re: UV-Nikkor 105mm does Bidens in VIS-UV
Post by: Dr Klaus Schmitt on August 15, 2021, 23:50:50

Thanks guys!