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

Monday, March 11, 2019

American Museum of Natural History Exhibit T.Rex with simulated Tetrachromatic Vision

Today at March 11, 2019 the American Museum of Natural History in New York at Central Park officially opens up their new exhibit T.Rex: The Ultimate Predator through August 9, 2020 and it contains some of my work, as T-Rex was supposed to have tetrachromatic vision, as those were the ancestors or our today's birds, which have tetrachromatic vision.

For demonstrating this to its visitors, my Rudbeckia hirta flower shots in 3D stereo human vision as well as in simulated tetrachromatic vision were used.

I'm always amazed about the differences in our human trichromatic color perception and how that very same flower would look like, if seen through tetrachromatic eyes, being able to also see ultraviolet (UV) light, invisible to us humans!

Hence why I developed a method to simulate that, by mapping a 4-dimensional tetrachromatic color space into our trichromatic 3-dimensional one.

[click on image to see a STEREO image in large]

Human Trichromatic Vision: 


Tetrachromatic Vision (simulated, UV mapped as blue) 


I have written more about this flower HERE and about tetrachromatic vision 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

Thursday, February 28, 2019

Hypergon 26mm ultra wide angle lens for 3D Stereo

More today about that ultra wide angle large format lens I found a while ago which I have published about here: HYPERGON lens I have published before.

It turned out that it seems to be a quite useful lens for VIS and also for UV and IR on my UV camera(s), although it has quite some focus shift in UV and IR (as expected from that simple design). The focal length has been confirmed by further measurements to be around 25 - 26mm, so let's stay with 26mm.

Here (again) that technical article of my friend Marco Cavina, that covers such ultra wide angles nicely with lots of images and diagrams as well as showing never finished prototypes.

Now a photographic result of a spring crocus taken a few days ago ... [click on image to see a larger one]


This lens works very well for 3D stereo images, as it is sharp all over. I will certainly also this year do some UV work using this lens....

Just in case you are not able to see that crosseye 3S stereo image, here some instructions which may help:
1) look at the image, center on the middle gap between them (with your glasses on that you need for reading this test sharp = in focus)
2) place the pointer finger at your nose tip without changing your viewing
3) now still looking straigt to the image, try to focus on your finger
4) move the finger towards the gap between the images
5) follow the finger while keeping focused on it
6) at a certain moment an image "between the images" will appear (looking three dimensional); your finger will be approx. 20cm = 8 inches away from your nose (depending on viewing distance from screen)
7) move your concentration towards that "image between the images" and leave it there (and remove your finger then...)
8) that's it...

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

Wednesday, January 30, 2019

Bouquet of flowers in visible, reflected UV, simulated bee and butterfly vision using a Quartz Fluoride condensor lens

Today shots of a flower bouquet in reflected ultraviolet photography as well as simulated bee and butterfly vision using a f3.2 / 81mm Quartz Fluoride Condensor lens from an older UV-VIS spectrometer system. A variable aperture was added to the Quartz Fluoride Condensor lens to allow stopping down. UV filter used was the Baader-U filter, my "work horse" filter for reflected UV as well as my proprietary XBV filters for simulated bee and butterfly vision. All shots were done at approx. f5.6. Light source used was a modified for high UV output Xenon flash.

[click on image to see a larger one]

Human Vision (VIS):
 

Reflected UV (Baader-U):
 

Simulated Butterfly Vision:
 

Simulated Bee Vision:
 

Quadriptych of VIS, UV, sim. Butterfly and Bee vision (left to right, top to bottom):
 

This bouquet of flowers has mainly yellow and orange roses in it, which hardly have any UV reflection, but those white Camilla flowers do have long wave (around 385nm) UV reflection and all this gets nicely visible, also in simulated Bee and Butterfly vision, on both used lenses.

This older Quartz Fluoride Condensor lens does rather well in UV, but it only covers mft sensor format, possibly APS-C (with another modification).

I have written more about that old quartz fluoride condensor lens 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