Monday, April 8, 2019

Cliff maids - Lewisia cotyledon in reflected ultraviolet photography, simulated bee and butterfly vision

Today first 2019 shots of a long blooming, perennial spring flower Cliff maids - Lewisia cotyledon in reflected ultraviolet photography and simulated bee and butterfly vision. All shots were done at f8 in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter, as well as my XBV filters for simulated bee and butterfly vision. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was sunlight.

[click on image to see a larger one]

Human vision:
 

Reflected UV:
 

Simulated butterfly vision:
 

Simulated bee vision:
 

Quadriptych of human vision, UV, simulated butterfly and bee vision (left to right, top to bottom):
 

Bidens has a visible UV pattern, its petal tips are UV brighter around 385nm, its center is UV darker, so this gets quite nicely visible, also in simulated butterfly and bee vision.
 
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

Apache beggarticks - Bidens ferulifolia in reflected ultraviolet photography and simulated bee vision X

Today more shots of a long blooming spring flower "Rockstar" hybride Apache beggarticks - Bidens ferulifolia in simulated bee and butterfly vision. All shots were done at f8 using two different XBV filters for simulated bee vision. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was sunlight.

This is to show that alternative possibilities exist for simulating bee vision, here using two of my proprietary XBV filters.

[click on image to see a larger one]

Human vision:
 

Reflected UV:
 

Simulated bee vision:
 

Simulated bee vision - alternative:
 

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 simulated bee vision.

Here I wanted to show that simulation of bee vision is possible, with a mapping that avoids to use the color red, as bees are not able to see that color and still make the otherwise invisible UV pattern visible. The first filter preserves the visible yellow color the petals have in natural light, whereas the second one maps in such a way as to make the petal tips, which are highly UV reflective, white.

I have written about Bidens previously 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

Apache beggarticks - Bidens ferulifolia in reflected ultraviolet photography using an UV-LED IX

Today more shots of that long blooming spring flower "Rockstar" hybride Apache beggarticks - Bidens ferulifolia in reflected ultraviolet photography. All shots were done at f8 in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was sunlight as well as a Convoy S2 UV LED with Nichia UV chip inside.

This is to show how useful such an UV-LED can be, in case not enough sunlight is available. This UV torch has been equipped with a front UV transmission filter to cut away all visible blue light.

[click on image to see a larger one]

Human vision:
 

Reflected UV with sunlight:
 

Reflected UV with filtered Convoy S2 UV LED :
 

Bidens has a strong visible UV pattern, its petal tips are UV bright around 365nm, its center is quite UV dark, so this is an ideal test object to test out this small Convoy S2 UV-LED torch, which strongly enhances the visibility of this UV pattern.

Personally I prefer sunlight, but if this is lacking, or a very sharp image is needed, the nearly monochromatic UV-Light is an ideal and easy to get UV light source.


I have written about Bidens previously 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

Saturday, April 6, 2019

Apache beggarticks - Bidens ferulifolia in reflected ultraviolet photography, simulated bee and butterfly vision VIII

Today first 2019 shots of a long blooming spring flower "Rockstar" hybride Apache beggarticks - Bidens ferulifolia in reflected ultraviolet photography and simulated bee and butterfly vision. All shots were done at f8 in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter, as well as my XBV filters for simulated bee and butterfly vision. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was sunlight.

[click on image to see a larger one]

Human vision:
 

Reflected UV:
 

Simulated butterfly vision:
 

Simulated bee vision:
 

Quadriptych of human vision, UV, simulated butterfly and bee vision (left to right, top to bottom):
 

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 simulated butterfly and bee vision.

I have written about Bidens previously 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