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-   -   Tussilago farfara - Coltsfoot multispectral (http://www.openphotographyforums.com/forums/showthread.php?t=18137)

Dr Klaus Schmitt February 23rd, 2014 02:41 PM

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


(using the same old quartz fluorite lens @f8 as shown before here)

Doug Kerr February 23rd, 2014 07:14 PM

Hi, Klaus,

Quote:

Originally Posted by Dr Klaus Schmitt (Post 151498)
This early spring Coltsfoot flower has a very specific bulls-eye UV pattern . . .

Fabulous and fascinating!

Thanks so much.

Best regards,

Doug

Asher Kelman February 23rd, 2014 08:57 PM

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

Asher Kelman February 23rd, 2014 08:59 PM

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

Dr Klaus Schmitt February 24th, 2014 12:07 AM

Thanks Asher + Doug!

Dr Klaus Schmitt March 1st, 2014 03:09 PM

Here is more about that used lens: http://photographyoftheinvisibleworl...r-f3280mm.html

Asher Kelman March 1st, 2014 06:39 PM

Quote:

Originally Posted by Dr Klaus Schmitt (Post 151583)

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

Asher Kelman March 1st, 2014 06:48 PM

Quote:

Originally Posted by Dr Klaus Schmitt (Post 151583)


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):"

http://m6.i.pbase.com/o2/08/747708/1..._vs_C_U2_c.jpg


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

http://m4.i.pbase.com/o2/08/747708/1...vs_C_VIS_c.jpg


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

Dr Klaus Schmitt March 2nd, 2014 03:06 AM

Asher,

the CERCO 94mm is a quartz fluorite LENS with a focal length of 94mm, it is not a filter!

Dr Klaus Schmitt March 2nd, 2014 03:23 AM

Quote:

Originally Posted by Asher Kelman (Post 151584)
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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Posting images or text grants license to OPF, yet of such remain with its creator. Still, all assembled discussion 2006-2017 Asher Kelman (all rights reserved) Posts with new theme or unusual image might be moved/copied to a new thread!