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UV/IR Thermal or Xray Photography Humans happen to use visible light naturally but now we can go beyond the usual wavelengths we appreciate, to find out more about our world and ourselves.

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  #1  
Old February 23rd, 2014, 02:41 PM
Dr Klaus Schmitt Dr Klaus Schmitt is offline
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Default Tussilago farfara - Coltsfoot multispectral

This early spring Coltsfoot flower has a very specific bulls-eye UV pattern,
which gets easily visible here.

Human vision:


UV vision:


Simulated bee vision:


Triptych for comparison:

(using the same old quartz fluorite lens @f8 as shown before here)
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  #2  
Old February 23rd, 2014, 07:14 PM
Doug Kerr Doug Kerr is offline
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Hi, Klaus,

Quote:
Originally Posted by Dr Klaus Schmitt View Post
This early spring Coltsfoot flower has a very specific bulls-eye UV pattern . . .
Fabulous and fascinating!

Thanks so much.

Best regards,

Doug
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  #3  
Old February 23rd, 2014, 08:57 PM
Asher Kelman Asher Kelman is offline
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Human vision:


Beautiful plant! Although some websites suggest this as a great edible plant, great for salads, it has toxix components which should be avoided. In fact, the alkaloids have perhaps the most potent mutagenic properties on our cells and are carcinogenic.

There's a plant variety which has been bred especially to be free of these health concerns.

Asher
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Old February 23rd, 2014, 08:59 PM
Asher Kelman Asher Kelman is offline
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Cool

Please note that one has to get the safe varieties for salads!

"Clonal plants of colstfoot free of pyrrolizidine alkaloids were then developed in Austria and Germany.[11] This has resulted in the development of the registered variety Tussilago farfara Wein which has no detectable levels of these alkaloids. Source
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Old February 24th, 2014, 12:07 AM
Dr Klaus Schmitt Dr Klaus Schmitt is offline
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Thanks Asher + Doug!
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Old March 1st, 2014, 03:09 PM
Dr Klaus Schmitt Dr Klaus Schmitt is offline
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Here is more about that used lens: http://photographyoftheinvisibleworl...r-f3280mm.html
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  #7  
Old March 1st, 2014, 06:39 PM
Asher Kelman Asher Kelman is offline
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Quote:
Originally Posted by Dr Klaus Schmitt View Post
Klaus,

This is a fascinating project.


The idea of this lens is ambitious and simple, a multispectral lens for cameras we use that is within reach of enthusiasts and researchers on a budget. I see such a lens being used in police departments, schools where budgets would limit acquisition of more costly first line lenses from Zeiss, Coastal Optics and the like. So what's the price range likely to be?

Asher
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  #8  
Old March 1st, 2014, 06:48 PM
Asher Kelman Asher Kelman is offline
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Quote:
Originally Posted by Dr Klaus Schmitt View Post

Klaus,

From your blog on the multispectral lens:

"The Diptych of Gazania (lab, light source Xenon) reflected UV image using Baader-U filter - X80QF (left), Cerco 94mm (right):"




and "Diptych of Gazania (lab, light source Xenon) Visual image using UV/IR Cut filter - X80QF (left), Cerco 94mm (right): "




The Cerco filter seems to give a far sharper and more contrasty result. Is that amore expensive filter and what does the 94mm specification refer to?

Asher
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Old March 2nd, 2014, 03:06 AM
Dr Klaus Schmitt Dr Klaus Schmitt is offline
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Asher,

the CERCO 94mm is a quartz fluorite LENS with a focal length of 94mm, it is not a filter!
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  #10  
Old March 2nd, 2014, 03:23 AM
Dr Klaus Schmitt Dr Klaus Schmitt is offline
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Quote:
Originally Posted by Asher Kelman View Post
Klaus,

This is a fascinating project.


The idea of this lens is ambitious and simple, a multispectral lens for cameras we use that is within reach of enthusiasts and researchers on a budget. I see such a lens being used in police departments, schools where budgets would limit acquisition of more costly first line lenses from Zeiss, Coastal Optics and the like. So what's the price range likely to be?

Asher
Yes, this was the idea behind I was looking for for years now actually until I found this solution.

Since you asked for the price range, it will be around 35% of the mentioned high ticket lenses.
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