[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:

This Coltsfoot flower has a well known bulls-eye UV pattern, its center is UV dark, whereas its petals strongly reflect around 365nm. This older quartz fluorite lens is reproducing this quite well also in the studio and all that gets nicely visible.
There are "in situ" shots of that flower HERE.
Stay tuned, more will follow on that fascinating subject...