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

Tuesday, January 8, 2019

Russian Telegoir f2.8 / 200mm prototype lens for reflected ultraviolet (UV) and infrared (IR) photography

Today more tests shots in reflected ultraviolet and infrared photography with an older Russian multicoated Telegoir f2.8/200mm prototype lens, designed in 1975 and built 1991. UV filter used was a Schott UG1 + BG38 filter stack, as well as a B+W 092 (Schott 695nm) IR filter. All shots were done at f5.6. Light source used was sunlight on a rather grey day.

[click on image to see a larger one]

Visible Light:
 

Schott UG1+BG38 filter:
 

Schott IR filter:
 

VIS and UV image side-side:
 


VIS and IR image side-side:
 

This Telegoir lens has despite its modern MC coating a surprisingly useful UV transmission as well as for IR. A further feature seems to be that this lens has a very small focus shift in UV as well as in IR of less than 1%!

I have written about this 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

Russian Telegoir f2.8 / 200mm prototype lens for reflected ultraviolet (UV) photography

Today tests shots in reflected ultraviolet photography of an Oncostele orchid with an older Russian multicoated Telegoir f2.8/200mm prototype lens, designed in 1975 and built 1991. UV filter used was a Schott UG1 + BG38 filter stack. All shots were done at f5.6. Light source used was a modified Xenon flash as well as a Nichia high power UV LED emitting at 365nm.

[click on image to see a larger one]

Schott UG1+BG38 filter stack with Xenon flash:
 

Schott UG1+BG38 filter stack with UV LED:
 

Schott UG1+BG38 filter stack with UV LED whitebalanced:
 

Visible light image:
 

VIS and UV image side-side:
 

This Telegoir lens has despite its MC coating a surprisingly high UV transmission and I will try it out outside, once weather is permitting. A further feature seems to be that this lens has a very small focus shift!

I have shown more about this flower in UV HERE

Outdoor shots in UV and IR using this 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

Tuesday, January 1, 2019

ISCO Cine Projection lens for reflected ultraviolet (UV) photography

To start this year 2019, today tests shots in reflected ultraviolet photography of an Oncostele orchid with a modern German high speed ISCO f2/100mm movie projection lens. UV filter used was a Schott UG1 + BG38 filter stack as well as my work horse UV transmission filter, the Baader-U. All shots were done at f2 as this lens has no iris. Light source used was a modified Xenon flash.

[click on image to see a larger one]

Schott UG1+BG38 filter stack:
 

Baader-U filter:
 

This ISCO lens has despite its MC coating a surprising high UV transmission and I will certainly elaborate more on those type of lenses!

 
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