Monday, August 19, 2019

St. John's wort - Hypericum in reflected ultraviolet photography and simulated bee and butterfly vision

Today some outdoor shots of that attractive yellow flower, a St. John's wort - Hypericum sp. shot in reflected ultraviolet photography, 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):
 

Hypericum's outer petals strongly reflect UV around 365nm, whereas its stamens are quite darker, reflecting around 385nm, hence forming UV nectar guides for UV seeing insects. This all invisible to us humans, but clearly visible to bees and butterflies, and all this gets nicely visible here, also in simulated bee and butterfly 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

Saturday, August 17, 2019

The Bausch & Lomb f4.5 / 9" (229mm) lens for reflected UV

Quite a few years ago I got an older lens, which was made many years ago by famous lens maker Bausch & Lomb, Rochester NY. It is a golden color coated, heavy and well made f4.5 / 9" (229mm) lens which attracted me, since it was made to record images displayed by a P-16 phosphor screen. Nothing special actually, but since P-16 phosphor emits at about max. 380nm, that attracted me most for my UV work.

 

A while ago I tested it against the Coastal Optics Micro Apo 105mm and the Nikon UV Nikkor 105mm and it perfomed very well.

[click on image gets you a larger image]

Today now the spectrometric results in comparison to the Kuribayashi 3.5/35mm lens, one of the best performing "normal" lenses for UV:



It gets pretty clear that the B&L lens has a very high UV performance, at 365nm it transmits 74%, whereas the Kuribayashi has 80%, so very close to it. A very useful long focal length lens for reflected 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

Monday, July 22, 2019

Treasury flower - Gazania rigens in reflected ultraviolet photography and simulated bee and butterfly vision XXVIII

Today more outdoor shots of that long blooming flower, a orange-red Gazania flower, the Treasury flower - Gazania rigens shot in reflected ultraviolet photography, 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 and some Nichia 365nm UV LED help.

[click on image to see a larger one]

Human vision:
 

Reflected UV:
 

Reflected UV with 365nm UV LED light:
 

Reflected UV with alternative UV filter:
 

Reflected UV with alternative UV filter and 365nm UV LED light:
 

Quadriptych of human vision, UV, alternative filtered UV (with and without UV LED light):
 

This Gazania's outer petals strongly reflect UV around 365nm, whereas the inner petal parts are quite darker, hence forming UV nectar guides for UV seeing insects. There are also some highly UV reflecting marks inside around a dark UV center, all invisible to us humans, but clearly visible to bees and butterflies, and all this gets nicely visible here.

I have written about this Gazania 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

Treasury flower - Gazania rigens in reflected ultraviolet photography and simulated bee and butterfly vision XXVII

Today some outdoor shots of that long blooming flower, a orange-red Gazania flower, the Treasury flower - Gazania rigens shot in reflected ultraviolet photography, 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):
 

This Gazania's outer petals strongly reflect UV around 365nm, whereas the inner petal parts are quite darker, hence forming UV nectar guides for UV seeing insects. There are also some highly UV reflecting marks inside around a dark UV center, all invisible to us humans, but clearly visible to bees and butterflies, and all this gets nicely visible here, also in simulated bee and butterfly vision.

I have written about this Gazania 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

Wednesday, July 17, 2019

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

Today shots of that long blooming spring flower 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 a new alternative "colorful" XSP UV transmission filter, and my XBV filters for simulated bee and butterfly vision. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was sunlight and a little help from my Nichia 365nm UV LED.

[click on image to see a larger one]

Human vision:
 

Reflected UV:
 

Alternative colorful reflected UV filtering:
 

Simulated butterfly vision:
 

Simulated bee vision:
 

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

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 in simulated butterfly and bee vision, also using that standard UV (Baader U) and new alternative reflected UV filter which delivers rather colorful UV images.

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

Tuesday, July 2, 2019

Cobweb house-leek flower - Sempervivum arachnoideum in reflected ultraviolet photography and simulated bee and butterfly vision II

Today more shots of a Cobweb house-leek flower - Sempervivum arachnoideum in reflected ultraviolet photography and simulated bee and butterfly vision. All shots were done at f11 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 a modified Xenon flash.

[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):
 

Sempervivum flowers have a distinct UV reflection, their petals have a dark center center line, the outside part is UV darker and all this gets nicely visible here, also in simulated bee and butterfly vision.

I have posted about this flower before HERE

More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos

Thursday, June 20, 2019

Rudbeckia hirta - Human vs simulated animal vision: butterfly, bee, dog, horse, bat

Today comparison shots of a Rudbeckia hirta flower Black Eyed Susan - Rudbeckia hirta using visible, reflected ultraviolet photography to create simulated animal vision images. 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 animal vision. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was a modified Xenon flash.

[click on image to see a larger one]

Human vision:
 

Simulated butterfly vision:
 

Simulated bee vision:
 

Simulated dog vision:
 

Simulated horse vision:
 

Simulated bat vision:
 

Hexaptych of the above:
 


  1. Humans have trichromatic vision, they see Blue, Green, Red
  2. Butterflies see UV, Blue, Green, Red, they are Tetrachromats
  3. Bees see UV, Blue, Green, they are Trichomats
  4. Dogs are Dichromats, see Blue and Yellow, but also some UV
  5. Horses are Dichromats, they see Blue and Yellow, but no UV
  6. Bats do not see color, but some are sensitive to UV also
The idea behind these mappings is, to demonstrate the different forms of vision, including the ability to see UV and with this ability, to see patterns which only appear in ultraviolet light (UV) but invisible to us humans.

I chose Rudbeckia, as it has a strong UV pattern, its petal tips are UV bright around 365nm, buts its center is quite UV dark, so this gets quite nicely visible, hence why I used this flower 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