Today in 2021 more about that long blooming spring flower Apache beggarticks - Bidens ferulifolia in reflected ultraviolet photography and simulated bee and butterfly vision. All shots were done at f11 in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was a modified for high UV output Studio flash.
[click on image to see a larger one]
Animated Gif image to show that invisible pattern (need to click):
Bidens has a strong visible UV "bullseye" pattern, its petal tips are UV bright around 365nm, its center is quite UV dark, so this gets quite nicely visible, also in this animated Gif-Image.
I have written about Bidens previously HERE
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