Thursday, June 20, 2019

Rudbeckia hirta - Human vs simulated animal vision: butterfly, bee, dog, horse, bat

Today comparison shots of a Rudbeckia hirta flower Black Eyed Susan - Rudbeckia hirta using visible, reflected ultraviolet photography to create simulated animal vision images. All shots were done at f8 in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter, as well as my XBV filters for simulated animal vision. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was a modified Xenon flash.

[click on image to see a larger one]

Human vision:

Simulated butterfly vision:

Simulated bee vision:

Simulated dog vision:

Simulated horse vision:

Simulated bat vision:

Hexaptych of the above:

  1. Humans have trichromatic vision, they see Blue, Green, Red
  2. Butterflies see UV, Blue, Green, Red, they are Tetrachromats
  3. Bees see UV, Blue, Green, they are Trichomats
  4. Dogs are Dichromats, see Blue and Yellow, but also some UV
  5. Horses are Dichromats, they see Blue and Yellow, but no UV
  6. Bats do not see color, but some are sensitive to UV also
The idea behind these mappings is, to demonstrate the different forms of vision, including the ability to see UV and with this ability, to see patterns which only appear in ultraviolet light (UV) but invisible to us humans.

I chose Rudbeckia, as it has a strong UV pattern, its petal tips are UV bright around 365nm, buts its center is quite UV dark, so this gets quite nicely visible, hence why I used this flower here.
Stay tuned, more will follow on that fascinating subject...

More info on this very interesting field may be found on my site