Tuesday, April 22, 2014

Apache beggarticks - Bidens ferulifolia in deep reflected ultraviolet photography IV

Today more shots of a spring flower I have written about before, Apache beggarticks - Bidens ferulifolia in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter as well as my deeper into UV reaching Jupiter-U and Suaturn-U filters. Lens was a CERCO 94mm quartz fluorite lens. Light source was a Xenon flash. All shots were done at about f5.6.

[click on image to see a larger one]

Visible light image:

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):

Quadtriptych of the above:

Bidens has a strong visible UV pattern, its petal tips are UV bright around 365nm, its center is quite UV dark, so this gets quite nicely visible also in deeper UV.

The same shots developed from RAW files may be seen 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