Here even more shots of that special Prairie flower, Ashy Sunflower - Helianthus mollis in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter as well as in simulated bee vision using my XBV6 filter. Lens was my CERCO 94mm quartz flourite lens. Light source was sunlight. All shots were done at about f5.6.
[click on image to see a larger one]
Visible light image
UV image using Baader-U filter (approx. 320-395nm, effective peak approx. 375nm):
Simulated bee vision image using experimental XBV filter:
Triptych of the above images:
Also here this flower shows a very specific and unique UV pattern, its petals are UV reflective around 385nm up to the middle (which I haven't seen anywhere before) and additionally reflect at 365nm at its tips and the rest and its center is UV dark forming an UV bullseye pattern, and all this gets nicely visible. It turned out to be quite difficult to map this specific pattern into the bee vision image. I will do more research about this species...
Stay tuned, more will follow on that fascinating subject...