Looking for a photo with an odd optical effect at night through trees

Matt Grunau

Adobe Demigod
Long title, sorry about that.

I have noticed a strange optical effect that happens usually though trees in winter when there is ice on the branches and is backlit by the moon or something like a streetlight. It's best in winter, because there are no leaves, though I have seen it happen during summer months through light foliage.

Here's the best I can describe it:

Imagine looking at a streetlight through the branches of trees. For some reason, the specular highlights on the branches always forms a circular pattern. It doesn't matter what angle you look, you can change positions, and the effect it the same. I think when the branches are wet with dew, or have ice on them, the water helps accentuate the effect, though it can happen with dry branches, just not as pronounced.

I am just curious if anyone else has seen this, and why the pattern of light hitting the branches is always round.

It's not something you can see in the daytime, only at night where light is much less.

I am sure optically there is a reason for it, but I have searched everywhere for an example and explination and can't find anything. I've tried to replicate the look in Photoshop with just a photo of the branches backlit, but I can't get satisfactory results.

Since there are so many photographers here, and since a lot of you like night pics and like to shoot nature, I was hoping someone had a pic, or even if someone has seen what I mean. Sometimes, when there is a little fog, you even get a bit of volumetric type lighting, which accentuates it even more.

It's a really cool phenomenon, and I was just curious.

I have a side and personal project where I would like to have this included, but I for the last four nights, searching around outside my house, I have been unable to get it.

Any help, pics, or just people that have seen it and can offer some advice on maybe how to set up properly to shoot one, or if anyone has ever just seen it would be great.

Thanks all.



M.



EDIT: Found some ones that were close, but not as clear as I would like:

1190268024.jpg


1190268068.jpg
 
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My guess is because branches are cylindrical profile the glancing angle of reflection follows you... much like if you look at a chrome pipe you always see your own reflection as you walk around it.

The tree branches could be at any angle (and ARE at various angles) but because of the cylindrical shape the light follows you... the reason this shape forms a round array is because your light reference is a round point source (more or less) which gives you the reference in the branches.

No matter what placement you are on the other side of the tree from the light source... the glancing angles reflecting the light are the only ones you'll see from your vantage point... somebody standing 10' to the side of you will get their own show off different parts of those same branches.

Any more questions for Mr. Guessing about Science?
 
Any more questions for Mr. Guessing about Science?

Ha!

Smart ass. :evil:


No, no more questions, I've always just found that a cool phenomenon and wanted to know if anyone had any ideas.

Good answer though. Although I was thinking it had to do with the behavior of light somehow, and can't find any info on it.
 
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