Deep UV reflected photography - Uranus-U filter

Today again about that Phalaenopsis orchid, but this time used as a target for deep UV reflected photography. Usually I use my "work horse" UV filter, the Baader-U filter, but this time also the Saturn-U (300-350nm, eff. 325nm) and Uranus-U (300-325nm, eff. 313nm) filter, the latter newly introduced here now. Lens used was the 94mm CERCO quartz fluorite lens. Light source was a modified for UV high power Xenon flash.

Here now some results: [click on image to see a larger one]

visible light image using UV/IR cut filter:
 

UV image using Baader-U filter (approx. 320-395nm, effective peak approx. 375nm):
 

UV image using Jupiter-U filter (approx. 280-385nm, effective peak approx. 365nm):
 

UV image using Saturn-U filter (approx. 300-350nm, effective peak approx. 325nm):
 

UV image using Uranus-U filter (approx. 300-325nm, effective peak approx. 313nm):
 


Interesting to notice, how the visible details change when the used wavelength gets shorter and the appearance of that turquoise color. I'm looking forward to testing this with flowers having more prominent UV patterns, once spring is 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