As light source a 365nm UV LED was used here and no other modifications were done. Here the UV shot using the Baader 2" U-filter (320-390nm), just color balanced to taste, no other modifications done. Interesting to note that since this lens is a simple, yet sharp triplet design, quite some massive focus difference between visible focus and UV shows, nearly 50mm in this case (closer for UV). [actually also the reason why the UV image is somewhat larger]
The second shot I used the same UV LED, but the filter used was the Baader UV/IR Cut filter, to suppress UV and to allow for fluorescence.
Oh, and if someone wondered how that flower looks like in normal white light, there you go...
Did you notice these aphids wondering around...? It seems to grin right into the lens on that last shot!
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
