Today about a very common weed flower Bermuda Buttercup - Oxalis pes-caprae I shot shot at Mountain Vew, CA 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 fluorite lens. Light source was sun. All shots were done at f8.
[click on image to see a larger one]
Bermuda Buttercup - Oxalis pes-caprae in Human vision, reflected UV, simulated bee vision (left to right):
This attractive yellow weed flower shows quite a
tricky UV pattern, as shown in the following enhanced reflected UV
image, a UV bright ring set on a negative space around the dark in UV
petals, hence massively increasing contrast. Plus you also see the pyramidal cells in this enhanced
resolution image (UV gives approx. 1.6x higher resolution) , which allows pollinators a much better grip while being at the flower.
All this invisible to us humans, but visible to bees and butterflies, and all this gets nicely visible here.
Stay tuned, more will follow on that fascinating subject...