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UV/IR Thermal or Xray Photography Humans happen to use visible light naturally but now we can go beyond the usual wavelengths we appreciate, to find out more about our world and ourselves.

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Old October 10th, 2016, 04:19 PM
Dr Klaus Schmitt Dr Klaus Schmitt is offline
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Default Brown Eyed Susan multispectral

Rudbeckia fulgida aka Brown Eyed Susan

Human vision, Ultraviolet vision, simulated Butterfly vision, simulated Bee vision
(left to right, top to bottom)

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https://www.flickr.com/photos/kds315/ my normal photographic work
http://photographyoftheinvisibleworld.blogspot.com/ my ultraviolet (UV) work
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Old October 10th, 2016, 05:44 PM
Asher Kelman Asher Kelman is offline
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Quote:
Originally Posted by Dr Klaus Schmitt View Post
Rudbeckia fulgida aka Brown Eyed Susan

Human vision, Ultraviolet vision, simulated Butterfly vision, simulated Bee vision
(left to right, top to bottom)

Klaus,

These are so remarkably different patterning. Has anyone made any substantial progress in deciphering some of the wvolutionary advantages of the variations we see here? Is there anything about the selective pressure on this plant's survival over the eons of its development that might suggest some advantage to either the plant or its pollinators?

To me the first one with human vision is the most beautiful, as expected. But we do not, AFAIK, excerpt any selective pressure on this plant!

Asher
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Old October 12th, 2016, 02:29 AM
Dr Klaus Schmitt Dr Klaus Schmitt is offline
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Well, it is ongoing scietific research, in which I participate a bit, but of course there is still a lot to discover....

I have published a bit about flowers competing in a natural environment including some scientific measurements and photographic examples:
http://photographyoftheinvisibleworl...d-gazania.html

An example with two yellow flowers, one having a prominent UV pattern:
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Old October 12th, 2016, 03:05 PM
Asher Kelman Asher Kelman is offline
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Klaus,

The differences in UV reflection are very strong. Has anyone studied total accumulated visits of pollinators and the percent fertilization of ova in this comparison of UV reflectivity?

Asher
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Old October 12th, 2016, 03:57 PM
Dr Klaus Schmitt Dr Klaus Schmitt is offline
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Klaus,

The differences in UV reflection are very strong. Has anyone studied total accumulated visits of pollinators and the percent fertilization of ova in this comparison of UV reflectivity?

Asher
no clue, but evolution gives you an answer: it it wouldn't be beneficial, it would have not developed and stayed to last! Nature does not waste energy and effort...only humans do.
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