ultraviolet pattern in a flower (Helianthus tuberosus)
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ultraviolet pattern in a flower (Helianthus tuberosus)
The picture shows the ultraviolet pattern in the Jerusalem-sunflower (Helianthus tuberosus).
I used an old digital camera (Pentax istD) an old russian objectiv without coating and a very new and modern ultraviolet filter from Baader (developped for astronomy).
The first picture shows the flower without the filter, the second with it (i.e. without any visible light).
(I made the photographs 3th 10.2008)
Franz
I used an old digital camera (Pentax istD) an old russian objectiv without coating and a very new and modern ultraviolet filter from Baader (developped for astronomy).
The first picture shows the flower without the filter, the second with it (i.e. without any visible light).
(I made the photographs 3th 10.2008)
Franz
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- Location: Italy
Thank your for your answers!
for David (dmillard): what camera are you using and how are the results?
(as objective I used the russian Industar 61)
for Elf: for the moment I can not explain the red tint, but 2 things for me are important:
1. I excluded completely the visible light
2. The red colour is not important for me. Important is the black spot (you could not invent it). This spot is to explain with biological reasons.
for Cyclops:
the "dark eye" serves the plant for attracting the attention of the bees. It is a strategy (not the only one) developped during the evolution. Because the bees are also able to see ultraviolet and polarised light - according to the famous studies of Nobel-prize- winner Karl von Frisch. Bees prefer the dark coulor and they are not able to see the red colour.
best regards
Franz
for David (dmillard): what camera are you using and how are the results?
(as objective I used the russian Industar 61)
for Elf: for the moment I can not explain the red tint, but 2 things for me are important:
1. I excluded completely the visible light
2. The red colour is not important for me. Important is the black spot (you could not invent it). This spot is to explain with biological reasons.
for Cyclops:
the "dark eye" serves the plant for attracting the attention of the bees. It is a strategy (not the only one) developped during the evolution. Because the bees are also able to see ultraviolet and polarised light - according to the famous studies of Nobel-prize- winner Karl von Frisch. Bees prefer the dark coulor and they are not able to see the red colour.
best regards
Franz
Yea being a plant enthusiast I know about how bees use the UV light to find the nectar(or are the plants using the bees?)Franz Neidl wrote:for Cyclops:
the "dark eye" serves the plant for attracting the attention of the bees. It is a strategy (not the only one) developped during the evolution. Because the bees are also able to see ultraviolet and polarised light - according to the famous studies of Nobel-prize- winner Karl von Frisch. Bees prefer the dark coulor and they are not able to see the red colour.
best regards
Franz
Fascinating stuff
Canon 5D and 30D | Canon IXUS 265HS | Cosina 100mm f3.5 macro | EF 75-300 f4.5-5.6 USM III | EF 50 f1.8 II | Slik 88 tripod | Apex Practicioner monocular microscope
Since we can't see UV, something had to interpret the color. It would be interesting to see other interpretations, perhaps with the red color cast removed. The workflow shown by Cyberspider in this thread may work: http://www.photomacrography.net/forum/v ... php?t=6518.Franz Neidl wrote:Thank your for your answers!
for Elf: for the moment I can not explain the red tint, but 2 things for me are important:
1. I excluded completely the visible light
2. The red colour is not important for me. Important is the black spot (you could not invent it). This spot is to explain with biological reasons.
Franz
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- Location: Reading, Berkshire, England
Hello Franz,Franz Neidl wrote:Thank your for your answers!
for David (dmillard): what camera are you using and how are the results?
(as objective I used the russian Industar 61)
For UV, I currently use a Nikon D70 with a 35mm Noflexar or Nikon 63mm f/3.5 enlarging lens, with a pair of Vivitar 283 flashes with the plastic panels removed (I wish I could afford a 60mm Coastal Optics lens ). Stacking UV images works well, allowing you to use a larger aperture and obtain a greater depth of field. I'll try to post some images this Sunday, and would definitely enjoy seeing more of yours.
Best regards,
David
I got to wondering. If pieces of such flowers were examined under a microscope using U V light. Get close up views of the U V emitting parts of the plants cells! Anyone done this?
Canon 5D and 30D | Canon IXUS 265HS | Cosina 100mm f3.5 macro | EF 75-300 f4.5-5.6 USM III | EF 50 f1.8 II | Slik 88 tripod | Apex Practicioner monocular microscope
Very nice one Franz!
I usually use Bibble and "click white" to
change the red directly from the Nikon
RAW files (or jpg) to convert it "al gusto"
Since UV by definition has no "color" you
could choose whatever you want. I usually
use the short wavelength end (blue or violet
for it), since this is how I see UV.
The "red tint" comes from the UV sensitivity
of the RED CCD channel.
I usually use Bibble and "click white" to
change the red directly from the Nikon
RAW files (or jpg) to convert it "al gusto"
Since UV by definition has no "color" you
could choose whatever you want. I usually
use the short wavelength end (blue or violet
for it), since this is how I see UV.
The "red tint" comes from the UV sensitivity
of the RED CCD channel.
Last edited by kds315* on Mon Feb 02, 2009 5:28 am, edited 1 time in total.
Klaus
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
http://photographyoftheinvisibleworld.blogspot.com/ my UV diary
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
http://photographyoftheinvisibleworld.blogspot.com/ my UV diary
Something like this? Not really micro though...(Primula leaf)Cyclops wrote:I got to wondering. If pieces of such flowers were examined under a microscope using U V light. Get close up views of the U V emitting parts of the plants cells! Anyone done this?
Last edited by kds315* on Mon Feb 02, 2009 5:46 am, edited 3 times in total.
Klaus
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
http://photographyoftheinvisibleworld.blogspot.com/ my UV diary
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
http://photographyoftheinvisibleworld.blogspot.com/ my UV diary
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- Posts: 5786
- Joined: Sun Mar 09, 2008 2:17 am
- Location: Reading, Berkshire, England
Klaus
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
http://photographyoftheinvisibleworld.blogspot.com/ my UV diary
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
http://photographyoftheinvisibleworld.blogspot.com/ my UV diary