Interesting bit from Dick Hutchinson's site at:
SHOOTING THE AURORA BOREALIS
http://www.ptialaska.net/~hutch/aurora.html
about getting interference fringes in your pictures if you use filters on
your lens (because the aurora light is near monochromatic, you get a kind of
Newton's Rings effect between the front element and the filter, I guess. Or
they are from the nearly parallel faces of the filter. He even has a demo
picture of this effect.
So for Aurora he says don't use filters.
I reckon that I have seen a very similar effect on my car windows under
yellow/orange near monochromatic low pressure sodium vapour lamps, when
looking from the outside of the car at night.
Dave Bellamy.
http://members.aol.com/synthchap/
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