I got this mentioned older lens, which was made decades ago by famous lens maker STEINHEIL . It is a possibly single coated, well made 2.8/50mm lens which attracted me, since it showed some good UV transmission which I have previously shown. Now today some outdoor shots at f11, light source was overcast sky. Target was a Lewisia cotylodon flower.
[click on image gets you a larger image]
VIS image using UV/IR Cut filter:
UV image using Baader-U filter:
Simulated butterfly vision:
Simulated bee vision:
Quadryptich of human vision, reflected UV, simulated bee and butterfly vision (left to right, top to bottom):
Lewisia has a visible UV pattern, its petal tips are UV bright around 385nm, its center is UV dark, so this gets quite nicely visible, also in simulated butterfly and bee vision using this astonishing lens.
I have written more about that flower HERE
I have written about that used lens 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