Today more shots of that beautiful flower, originating from the USA Prairie, here today again that commercially sold hybrid of a Black-eyed Susan - Rudbeckia hirta (possibly R. hirta x R. fulgida) in reflected ultraviolet photography using different filters aside from the Baader-U filter, but different ones today for simulated bee and butterfly vision but also part of my XBV filter set. All shots were done at f8-f11 on my balcony. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was direct sunlight.
PS: These other filters (filter stacks actually) I used have partially corroded over time, so I had to polish them using finest Cerium-Oxide powder. I made some slurry with that using filtered water, then polished the filter glasses with that using a very soft cloth and small circular movements, then rinsed them clean and dried them. So these images hopefully prove that this was successfully done....I think so.
[click on image to see a larger one]
Human vision:
Reflected ultraviolet (UV - false color):
Simulated butterfly vision:
Simulated bee vision:
Quadriptych of human vision, ultraviolet, simulated bee and butterfly vision (left to right, top to bottom):
This flower shows a very prominent UV bullseye pattern, as its petal tips are very UV bright (around 365nm) and its center is very UV dark, and all this gets nicely visible, also in simulated bee and butterfly vision.
I have previously written about that 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
Today about my works being used with my permission by the Naturpark Kaunergrat (Pitztal – Fließ – Kaunertal) in Tyrol / Austria. Their idea was to show visitors how bees and butterflies see the world including their ability to see reflected ultraviolet (UV) light.
They chose to use an attractive yellow flower, a St. John's wort - Hypericum sp. which were shot by me 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 is all invisible to us humans, but clearly visible to bees and butterflies, and all this will be nicely visible to the visitors at Kaunergrat nature park Tyrol, Austria.
I have written more about 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
Those shown multispectral images of mine where shot in my studio with my "work horse" UV-Nikkor f4.5/105mm quartz fluorite lens using the Baader UV/IR Cut filter and my proprietary XBV filters for simulated bee + butterfly vision. Light source in studio used was a Xenon flash modified for high UV output outside.
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
The UV-Nikkor 105mm lens is known to be a very well working one for multispectral imaging w/o focus shift, with a nice 1:2 close up focusing capability from infinity up to 48cm (0.48 meter). Sharpness is very good and so is its contrast, even from f4.5 onwards. With a Nikon PN-11 extension tube of 52.5mm length it reaches 1:1 (1x) magnification. It has the standard Nikon-F mount, and it covers full format sensors (41mm image diameter). It is defined to reach down to 190nm and up to 1300nm in near infrared; my measured transmission spectra of it may be seen here.
I have written more about this orchid 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
Today in June 2023 shots of a flower, hardly ever seen, but we have its fruit on our table often: Tomato - Solanum lycopersicum in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter, as well as in simulated bee and butterfly vision using my propriatary XBV filters. All shots were done at f8. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was sunlight (shade) as well as a 365nm UV-LED for another UV shot..
[click on image to see a larger one]
Human vision:
Reflected ultraviolet (UV):
Reflected ultraviolet (UV-LED 365nm):
Simulated bee vision:
Simulated butterfly vision:
Quadriptych of human vision, ultraviolet, simulated bee and butterfly vision (left to right, top to bottom):
This flower shows a very prominent and strong UV reflection around 365nm on its petals as well as dark lines leading to the UV-dark center, and all this gets nicely visible, 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
The UV-Nikkor 105mm lens is known to be a very well working one for multispectral imaging w/o focus shift, with a nice 1:2 close up focusing capability from infinity up to 48cm (0.48 meter). Sharpness is very good and so is its contrast, even from f4.5 onwards. With a Nikon PN-11 extension tube of 52.5mm length it reaches 1:1 (1x) magnification. It has the standard Nikon-F mount, and it covers full format sensors (41mm image diameter). It is defined to reach down to 190nm and up to 1300nm in near infrared; my measured transmission spectra of it may be seen here.
I have written more about this orchid 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
The UV-Nikkor 105mm lens is known to be a very well working one for
multispectral imaging w/o focus shift, with a nice 1:2 close up focusing
capability from infinity up to 48cm (0.48 meter). Sharpness is very
good and so is its contrast, even from f4.5 onwards. With a Nikon PN-11
extension tube of 52.5mm length it reaches 1:1 (1x) magnification. It
has the standard Nikon-F mount, and it covers full format sensors (41mm
image diameter). It is defined to reach down to 190nm and up to 1300nm in near infrared; my measured transmission spectra of it may be seen here.
I have written more about this orchid 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
