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Re: [OM] Astrophotography (Was Sorry!)

Subject: Re: [OM] Astrophotography (Was Sorry!)
From: DBellamy2k@xxxxxxx
Date: Wed, 15 Aug 2001 18:19:47 EDT
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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