Wednesday, April 11, 2018

Dwarf Tulip - Tulipa pulchella violacea in reflected ultraviolet photography, simulated bee and butterfly vision IV

Today about an early spring flower, I have written about before HERE, a Dwarf Tulip (Tulipa pulchella violacea) in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter as well as my XBV filters for simulating butterfly and bee vision. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was sunlight. All shots were done at f8.

[click on image to see a larger one]

Human Vision:

UV vision:

Simulated Bee vision:

Simulated Butterfly vision:

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

This dwarf tulip has an unusual pattern, its center is not UV bright, the inside petals reflect UV somewhat, but the bottom of the petals only in simulated bee and butterfly vision show an otherwise invisble pattern and all this gets quite nicely visible.

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, April 10, 2018

Dandelion - Taraxacum officinale flower in reflected ultraviolet photography and simulated bee and butterfly vision II

Today more about that common spring flower, Dandelion - Taraxacum officinale in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter as well as my XBV filters for simulating butterfly and bee vision. Just another specimen. Lens was a UV Nikkor 105mm quartz fluorite lens. Light source was sunlight. All shots were done at f8.

[click on image to see a larger one]

Visible light image:
 

UV image:
 

Simulated bee vision:
 

Simulated butterfly vision:
 

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

Also this different specimen of Dandelion flower has quite a prominent UV pattern, its petals are UV bright around 365nm, its center is UV dark, especially the anthers, and this gets quite nicely visible also in simulated bee and butterfly vision.

I have written 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

Dandelion - Taraxacum officinale flower in reflected ultraviolet photography and simulated bee and butterfly vision

Today about a common spring flower, Dandelion - Taraxacum officinale in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter as well as my XBV filters for simulating butterfly and bee vision. Lens was a UV Nikkor 105mm quartz fluorite lens. Light source was sunlight. All shots were done at f8.

[click on image to see a larger one]

Visible light image:
 

UV image:
 

Simulated bee vision:
 

Simulated butterfly vision:
 

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

This Dandelion flower has quite a prominent UV pattern, its petals are UV bright around 365nm, its center is UV dark, especially the anthers, and this gets quite nicely visible also in simulated bee and butterfly vision.

I have written 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

Friday, March 23, 2018

Denver Botanic Gardens 2018 pollination exhibit

The exhibition management of the Denver Botanic Gardens has contacted me about a forthcoming 2018 exhibut about pollinators. We have agreed that they will use some of my works to demonstrate how differently butterflies see the world compared to how we humans do.

These flowers will be on exhibit: Gaillardia, Linus, Rudbeckia, Crepis which are common in the Colorado wildlife area.

Gaillardia (top) and Rudbeckia (bottom) in human and simulated butterfly vision

Linus (top) and Crepis (bottom) in human and simulated butterfly vision


The exhibit will open in April 2018, so be sure to pay it and the Gardens a visit, certainly worth 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, March 21, 2018

Dwarf Tulip - Tulipa pulchella violacea in reflected ultraviolet photography, simulated bee and butterfly vision III

Today also about an early spring flower, I have written about before HERE, a Dwarf Tulip (Tulipa pulchella violacea) in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter as well as my XBV filters for simulating butterfly and bee vision. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was sunlight. All shots were done at f8.

[click on image to see a larger one]

Human Vision:

UV vision:

Simulated Butterfly vision:

Simulated Bee vision:

This dwarf tulip has a quite visible UV pattern, its center is UV bright, surrounded by long wave UV reflecting tips and all this gets quite nicely visible.

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, February 12, 2018

ZUFAR 4/350mm quartz fluorite catadioptric lens II

Today more about that Quartz Fluorite catadioptric ZUFAR-2CA f4/350mm anastigmat lens which took me over 10 years to find. It had been developed for the Soviet MARS 2 to 5 missions to planet Mars, was made of synthetic Quartz and Calcium Fluorite (CaF2) crystals to be able to work in UV and also visible light, thus allowing to take images 300-700nm without focus shift.


So today a few first test shots using this very special lens, due to lack of the mount which need to be designed and made, just some freelensing shots. "Freelensing" means holding the lens in front of the camera without any mount in between the two (!).

Here some visible light shots, showing how this lens performs. This first one is about 150 meters away:




and the following one about 15 meters:



The lack of chromatic aberration gets easily visible on that golden ball as well as on these shiny stainless steel exhaust pipes.

Now on to reflected UV images (300-400nm), here right out of camera:



and here with whitebalancing applied:


Being able to handheld a f4 350mm lens and shooting in reflected UV (300-400nm) is rather astonishing, a proof how much UV this lens is able to transmit. More about this lens will certainly follow here...

I have written about this lens before HERE


Stay tuned, more will follow on that fascinating subject...
 

Monday, February 5, 2018

ZUFAR 4/350mm quartz fluorite catadioptric lens

Today about a Quartz Fluorite catadioptric ZUFAR-2CA f4/350mm anastigmat lens which took me over 10 years to locate. It had been developed for the Soviet MARS 2 to 5 missions to planet Mars.



It was made of synthetic Quartz and Calcium Fluorite (CaF2) crystals to be able to work in UV and also visible light, 300-700nm without focus shift, so actually is an apochromatic (APO) f4/350mm catadioptric lens. The whole useful wavelength range is 230-700nm. Lens transmission is 60-65% and the lens resolution is 57 lpm in its center, 47 lpm in corners. Viewing angle is approx. 6 degrees. There has also been made a ZUFAR-1 lens with f4 / 500mm and 4 degrees viewing angle.

ZUFAR lenses have been designed in the 70s under the lead of Institute head and chief designer Prof. Volosov together with N. Khmelnikova, I. Driatskaya, K. Mikhailova at GOI, the russian state lens design institute in St. Petersburg / Leningrad. Details were published by Prof Volosov in 1974.

(Made for my use by my dear friend Marco Cavina)

Data of this lens, as well as its normal (= non catadioptric) quartz fluorite sister lenses
with shorter focal lengths may be found on my macrolenses database site HERE


This lens was made to be used on a very elaborate camera system which could take multispectral images on film, develop that and scan it and send the scanned data back to Earth in selectable resolutions (up to 2000x2000 pix, which took over one hour to transmit).


NASA also wrote about this lens (quote):

Zufar objectives were used on the television cameras carried by the Mars-2, 3, 4, and 5 spacecraft. The compact catadioptric quartz-fluorite anastigmat was developed as a result of research on the possible optical arrangements of lens and mirror-lens systems meeting the rigid criteria for spaceborne operation. The system is characterized by precise correction of all aberrations over a broad spectral range, about 300-700 nm. The spectral transmission is about 60% over this range. The Zufar-2CA version of the objective has a geometric aperture ratio of 1:4 and a focal length of 350 mm. The image format is 24 x 24 mm. The housing is 164 mm long and 130 mm in diameter, and the mass of the objective is 1500 g.

Here one of the published images from Mars taken on Mars-5 mission:




The lens will be given a suitable adaption to fit my digital multispectral cameras and I will certainly take multispectral photos with it as soon as possible and report about here later on.

There is more about this lens HERE including some first images taken with it.


Stay tuned, more will follow on that fascinating subject...