Monday, August 19, 2019

St. John's wort - Hypericum in reflected ultraviolet photography and simulated bee and butterfly vision

Today some outdoor shots of that attractive yellow flower, a St. John's wort - Hypericum sp. shot in reflected ultraviolet photography, simulated bee and butterfly vision. 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 bee and butterfly vision. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was sunlight.

[click on image to see a larger one]

Human vision:
 

Reflected UV:
 

Simulated butterfly vision:
 

Simulated bee vision:
 

Quadriptych of human vision, UV, simulated butterfly and bee vision (left to right, top to bottom):
 

Hypericum's outer petals strongly reflect UV around 365nm, whereas its stamens are quite darker, reflecting around 385nm, hence forming UV nectar guides for UV seeing insects. This all invisible to us humans, but clearly visible to bees and butterflies, and all this gets nicely visible here, also in simulated bee and butterfly vision.

Stay tuned, more will follow on that fascinating subject...

More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos