Winter Jasmine - Jasminum nudiflorum in reflected ultraviolet photography and simulated bee vision III

Today even more shots of a decorative winter flower Winter Jasmine - Jasminum nudiflorum in reflected ultraviolet using Baader-U filter and in simulated bee vision using my XBV6 filter. Lens used was an older fast cine lens lens. Light source was Xenon flash. All shots were done at f8. This time the UV image was individually whitebalanced.

[click on image to see a larger one]

Visible light image:  

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

Simulated bee vision image using experimental XBV filter:  

Triptych of the above images:  


This attractive winter flower shows its very specific UV pattern. Its center is UV dark, but its petals are strong UV reflective around 365nm, ie. UV bright, both invisible to us humans. Also this older cine lens is reproducing this quite well and all that gets nicely visible, here now matched to the CERCO quartz fluorite lens results.


Stay tuned, more will follow on that fascinating subject...

Winter Jasmine - Jasminum nudiflorum in reflected ultraviolet photography and simulated bee vision II

Today more shots of a decorative winter flower Winter Jasmine - Jasminum nudiflorum in reflected ultraviolet using Baader-U filter and in simulated bee vision using my XBV6 filter. Lens used was an older fast 75mm cine lens lens. Light source was Xenon flash. All shots were done at f8.

[click on image to see a larger one]

Visible light image:  

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

Simulated bee vision image using experimental XBV filter:  

Triptych of the above images:  


This attractive winter flower shows its very specific UV pattern. Its center is UV dark, but its petals are strong UV reflective around 365nm, ie. UV bright, both invisible to us humans. Also this older cine lens is reproducing this quite well and all that gets nicely visible.


Stay tuned, more will follow on that fascinating subject...

Old 105mm + 75mm Helioplan enlarger lenses for reflected ultraviolet photography

Today about some older, quite capable UV transmitting Helioplan enlarger lenses. I'm using a Gazania rigens flower for that test as well as my "work horse" UV filter, the Baader-U filter. Lenses used were older 75mm and 105mm Helioplan enlarger lenses of dialyte construction. Light source was Xenon light. All shots were done at f11.

[click on image to see a larger one]

Diptych image using 75mm lens, Visual and reflected UV using Baader-U filter (approx. 320-395nm, peak approx. 350nm):
 

Diptych image using 105mm lens, Visual and reflected UV using Baader-U filter (approx. 320-395nm, peak approx. 350nm):
 

Diptych image 75mm vs. 105mm lens, both reflected UV using Baader-U filter:
 

The comparison images clearly show that the 75mm has an edge over the 105mm lens in terms of UV tramsission, but also in terms of sharpness. Both lenses are nevertheless quite capable, despite their 50++ years of age.

P.S.: The visual images were not re-adjusted in focus, to show the small focus shift between VIS and UV.

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