Thursday, April 6, 2017

Petri Kuribayashi 35mm vs Kyoei Acall 180mm lens for reflected UV photography V

Today a spectrometric test using that previously mentioned Petri Kuribayashi f3.5/35mm lens, compared to a Kyoei Acall f3.5/180mm lens in M42 thread mount, as a proof that both actually have a very different lens transmission, especially in UV.

[click on image to see a larger one]



The Kuribayashi 35mm reaches much deeper into UV, even a bit below 320nm and shows a rather high UV at 365nm transmission of over 75%. However the Kyoei Acall f3.5/180mm tele lens seems to be a very different beast, as it has no useful at all UV transmission!

I have written about that lens before 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

Petri Kuribayashi 35mm vs Kyoei W. Acall 35mm lens for reflected UV photography IV

Today a spectrometric test using that previously mentioned Petri Kuribayashi f3.5/35mm lens, compared to the W. Acall f3.5/35mm lens in Leica Thread Mount (LTM), as a proof that both actually have a very different lens transmission, especially in UV.

[click on image to see a larger one]



The Kuribayashi 35mm reaches much deeper into UV, even a bit below 320nm and shows a rather high UV at 365nm transmission of over 75%. However the similar looking W. Acall 35mm seems to be a very different beast, as it has at 365nm only approx 5% UV transmission, so basically none useful at all!

I have written about that lens before 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 17, 2017

Gasometer Oberhausen Museum, Wonders of Nature Exhibit extended until end of 2017 IV

Gasometer Oberhausen Museum has reported a record breaking visitor count of 750.000 by end of 2016 for their "Wonders of Nature" exhibit  and has hence decided to extend until November 30, 2017. I have participated in that with some of my works in large prints and a video presentation. An impressive location it is, the highest Museum in Germany (116m high, 66m wide) showing some amazing exhibit areas inside:

(C) Gasometer Oberhausen

My contribution are some images of a Zinnia haageana flower in large prints, on display in their exhibition area below that 20 meter large earth globe, demonstrating the difference between our human vision, as well as a video presentation shown on LCD panel which originates from the BBC series "How to grow a planet - The hidden World of UV" which has several of my VIS and UV images of different flowers in it.


Gasometer Oberhausen, video presentation of my works: visible and ultraviolet images of the same flowers, showing nectar guides, invisible to us humans, but visible to bees!
Posted by Klaus Schmitt on Friday, March 11, 2016
Printed Zinnia (in UV light) in background, video display in foreground:


approx 3m / 9ft wide Zinnia image in ultraviolet light:


Zinnia haageana: Triptych of Human Vision, UV, Simulated Bee Vision (left to right):  

The exhibit shows in total some 150 large images and video presentations by the most famous nature photographers and is not only visually stunning, but also highly educative and suited for interested individuals as well as families and schools. Go have a look, it will be well worth it!

There is still a printed book available about it: Wunder der Natur, Die Intelligenz der Schöpfung ISBN/EAN: 9783837514629 (in German language)

I have written about that exhibit previously HERE

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

Monday, January 9, 2017

Moth orchid - Phalaenopsis in reflected ultraviolet photography and simulated butterfly and bee vision

Today studio shots of a decorative flower, Moth orchid - Phalaenopsis in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter, as well as in simulated butterfly and bee vision using my proprietary XBV filters. Lens was my UV-Nikkor 105mm quartz flourite lens. All shots were done at about f8. Light source was a modified Xenon flash, background was dark gray. [These shots were done with a new camera system and are available on request in very high resolution (40 and 60 Mp)]

[click on image to see a larger one]

Visible light image
 

UV image using Baader-U filter:
  

Simulated butterfly vision image:
  

Simulated bee vision image:
  

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

This attractive flower shows a not so prominent UV pattern around its labellum , and all this gets nicely visible also in simulated butterfly and bee vision.

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

Friday, December 23, 2016

Deep UV Ultraviolet Reflected Light Photography at UV-B and UV-C recording with candle light

Today another proof that reflected UV photography is doable at UV-B and UV-C using several special, up to NIR blocked, narrowband filters and a very different UV camera, an amplified 190-650nm MCP equipped video camera. Lens used was a CERCO f1.8/45mm quartz flourite lens. Light source was a candle flame.

[click on image to see a larger one]

This reveals, that the deeper one looks into UV, the area where the candle flame emits that UV moves from the top of the flame down to the sides of the flame. Pretty amazing how sensitive this type of camera is, as the needed amplification was still just in the lower 30% of the total available range.

I have previously written more about combustion and UV HERE.

Btw. Michael Faraday has in 1848 given six famous lectures about the chemical history of the candle, which may be read about HERE

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

Wednesday, December 14, 2016

Cloisonné ceramics in reflected ultraviolet and simulated bee vision photography

Today about ceramics, Cloisonné especially and reflected UV photography. I have three different objects here as targets, from Thailand and India. For that test I'm using my the UV-Nikkor 105mm, as well as my "work horse" UV filter, the Baader-U filter and my bee vision simulating XBV6 filter. Light source was a modified Xenon flash. All shots were done at f11.

[click on image to see a larger one]

Diptych Visual light (top) and reflected UV light image (bottom):
 

Diptych Visual light (top) and simulated bee vision image (bottom):
 

Interesting to see how in reflected UV light and especially in simulated bee vision imaging, the center piece shows otherwise invisible patterns.


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, December 6, 2016

ELCAN UV f5.6/52mm lens for reflected ultraviolet photography using an African Violet

Today about a highly specialized UV lens, the ELCAN (Ernst Leitz CAnada) UV f5.6/52mm lens, a one-off prototype (I don't know of any other special UV lens Leitz/Leica has ever made). In lack of a flower with UV pattern, I'm using a African violet hybride flower for that test as well as my "work horse" UV filter, the Baader-U filter. Light source was a modified Xenon flash. All shots were done at f8.

[click on image to see a larger one]

Visual light image:
 

Reflected UV using Baader-U filter:
 

Simulated Bee Vision image:
 

IR image:
 

Triptych Visual, reflected UV, Simulated Bee Vision (left to right):
 

This specialized UV lens works very well, there is hardly any focus shift visible, not even between UV and IR (!), contrast is high, there is no visible hostport and the lens renders very sharp and crispy images. A welcome new member of my small collection of such specialized lenses.

P.S.: The images were not re-adjusted in focus between all shots, to show that there is no visible focus shift between VIS and 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