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...
Polarized Reflected UV Photography
Moderators: rjlittlefield, ChrisR, Chris S., Pau
Polarized Reflected UV Photography
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
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:
Visible Light - Sunlight:
Reflected polarized UV, only sunlight:
Reflected polarized UV, using a 365nm UV LED:
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
-
- Posts: 1527
- Joined: Mon Jan 15, 2018 9:23 pm
- Contact:
Ineresting idea to automate that!!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.
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
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).
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).
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
So today about Lewisia - Cliffmaids in reflected and polarized light
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
- MarkSturtevant
- Posts: 1957
- Joined: Sat Nov 21, 2015 6:52 pm
- Location: Michigan, U.S.A.
- Contact:
Thanks, yep indeed they do use this.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.
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
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
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
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
Different approach used here, delivers more intense colors...
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