And here now the results of these test shots, identical conditions, shooting a piece of old sandlewood, using my UV Rodagon 60mm lens @f8, Baader U-filter, Nikon SB-140 UV flash .
Visual shot is left, UV shot on the right (bw version) [click on image to see a much larger image]:
And here a recent shot using the UV Nikkor 105mm, Xenon flash at f8, left UV shot (Baader U-filter 310-390nm, right shot white light, unfiltered) of skin (female hand, afro-american heritage)
It gets quite obvious, that the resolution of the UV shot is much higher.
Should I find the time, I will re-shoot that test using a monochromatic light source for UV, such as my Nichia 365nm UV LED lamp and a narrowband filter for visible light also, such as 546nm (green), and again compare the results then.
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