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Polarized Reflected UV Photography

 
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kds315*



Joined: 02 Feb 2009
Posts: 223

PostPosted: Mon Apr 06, 2020 5:44 am    Post subject: Polarized Reflected UV Photography Reply with quote

Today (after some too long hiatus) a bit about Polarized Reflected UV Photography, using a PHLOX - Rockfoil flower and a deep reaching (up to 320nm) circular polarizer in front of a Baader UV filter (320-390nm). Multiple images assembled into a animated gif.

Phlox flower in M-mode i.e. non exposure compensated:



Phlox flower in A-mode i.e. exposure compensated:



These are some early experiments, of course there is room for improvement, like stacking each pol filter position to get more DOF etc. but first things first...
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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
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kds315*



Joined: 02 Feb 2009
Posts: 223

PostPosted: Tue Apr 07, 2020 7:12 am    Post subject: Reply with quote

Here another example (white Saxifraga flowers), which shows the predicted effect my friend told me about: That bees have around their eyes sensors able to detect polarized light and there woud be flowers using that:

Visible Light - Sunlight:




Reflected polarized UV, only sunlight:




Reflected polarized UV, using a 365nm UV LED:


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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
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Macro_Cosmos



Joined: 15 Jan 2018
Posts: 628
Location: Sydney

PostPosted: Tue Apr 07, 2020 9:16 am    Post subject: Reply with quote

Interesting results! Reflected polarised light and in UV, looks very trippy.

I've been doing some PPL/XPL stuff recently. I'm thinking about automating the polariser's rotation so I can do video. A rubber wheel that's pushed against the polariser, should work out very well.
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kds315*



Joined: 02 Feb 2009
Posts: 223

PostPosted: Wed Apr 08, 2020 1:13 am    Post subject: Reply with quote

Macro_Cosmos wrote:
Interesting results! Reflected polarised light and in UV, looks very trippy.

I've been doing some PPL/XPL stuff recently. I'm thinking about automating the polariser's rotation so I can do video. A rubber wheel that's pushed against the polariser, should work out very well.


Ineresting idea to automate that!!
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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
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kds315*



Joined: 02 Feb 2009
Posts: 223

PostPosted: Sun Apr 12, 2020 5:18 am    Post subject: Reply with quote

Polarization is an effective tool in photography and cross-polarization is well know to allow to suppress shine and reflections from certain surfaces.

Here a few tests I have made after having been able to find suitable UV polarizers using a glass vase standing on an aluminum lab jack.

Visible light on top, reflected UV light at bottom. Zero, 45 and 90 degree polarizer angles (left to right).


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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
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kds315*



Joined: 02 Feb 2009
Posts: 223

PostPosted: Wed Apr 15, 2020 5:27 am    Post subject: Reply with quote

So today about Lewisia - Cliffmaids in reflected and polarized light


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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
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MarkSturtevant



Joined: 21 Nov 2015
Posts: 767
Location: Michigan, U.S.A.

PostPosted: Fri Apr 17, 2020 9:29 pm    Post subject: Reply with quote

That is very interesting. I know that some flowers will use UV reflective colors to communicate with bees. Some have stripes or other patterns as 'guides' to lead bees to the center -- communication between flowers and bees that we don't normally get to see.
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Mark Sturtevant
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kds315*



Joined: 02 Feb 2009
Posts: 223

PostPosted: Sat Apr 18, 2020 9:35 am    Post subject: Reply with quote

MarkSturtevant wrote:
That is very interesting. I know that some flowers will use UV reflective colors to communicate with bees. Some have stripes or other patterns as 'guides' to lead bees to the center -- communication between flowers and bees that we don't normally get to see.


Thanks, yep indeed they do use this.
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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
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kds315*



Joined: 02 Feb 2009
Posts: 223

PostPosted: Sun Apr 19, 2020 11:50 am    Post subject: Reply with quote

Well this is a bit on the scientific side, sheet Mica in polarized UV and visible light, different pol. angles.
If interested about the colors and why, I refer to the work of Mr Michel-Levy https://en.wikipedia.org/wiki/Polarized_light_microscopy#The_Michel-Levy_chart


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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
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kds315*



Joined: 02 Feb 2009
Posts: 223

PostPosted: Wed Apr 22, 2020 1:09 am    Post subject: Reply with quote

Different approach used here, delivers more intense colors...


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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
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