I used an OM-2SP set to auto with about 1 stop under exposure. The colour of
the aurora varies upon it's height in the sky (or stratosphere, or some
sphere). Green/white is the most common. It looks white with a touch of
green to the naked eye, but on film it is a definite green shade.
The problem is the oscillation. It appears as a curtain in the sky. With the
exposure times required, the aurora comes up as a smudge.
I took photos with my OM-1n at the same time and always under exposed.
What latitude are you at? I was at 68° south, on a ring around the south
magnetic pole. So the aurora was overhead.
The frequency is very low. 0 to 10 Hz, generally 0.5 to 2 hertz. If you are
interested I have a design to make an aurora detector.
Foxy
-----Original Message-----
>I stepped out of the house Tuesday night, and was treated to one of the
>most spectacular displays of the Northern Lights I have ever seen up
>here. (Northern Vermont)
>
>To the astrophotographers on this list, I ask: How is this phenomenon
>best recorded on film? Where does this type of light fall within the
>spectrum? I want to be able to record this with decent contrast, as
>well as showing some of the brighter stars. (I have an OM-1, a 2S and
>28, 35, 40, 50 and 100 Zuikos and plenty of Kodachrome)
>
>As an aside, I was also trying to figure out how "fast" these ripples of
>light were moving. . . .I am no physicist, but a quick amateur
>guestimate makes me think it might be pretty darn fast.
>
>
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