On 2011-12-16 21:44, Mark C wrote:
I'm gonna try to do that with snow crystals this winter. I'm not sure if a regular polarizer will work or if I need to somehow put the crystal in the middle between two cross polarized filters... Thanks for reminding me about that. (I knew there was something I forgot to do *last* winter....)
From my previous reading, Mark, I think a polarizer between the lens and subject will be enough. If my memory is working tonight, the effect happens because the geometry of the snow crystals combines with the polarization effects of the ice/air boundary effects to polarize the light as it passes through the crystal, or out of the crystal and back into "free space".
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