Re: [APML] Sierra Star Trails Question

["Stuart Heggie" <Stuart.J.Heggie@sympatico.ca>]

Allan, I think the theory of light pollution/reciprocity failure is a
possibility but I also think it is not impossible that it was an aurora. If
the two shots had been the same duration I'd be more sure but a green aurora
is perfectly possible. Here is a shot of an aurora where you'd have no doubt
of the colour (sorry about the clouds!):

http://www.astrofoto.ca/stuartheggie/cot_photos/Aurora_Nov7_2004_-6.html

Stuart
----- Original Message ----- 
From: "Allan & Julie Whetzel" <whetzel@cox.net>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Tuesday, August 23, 2005 1:10 AM
Subject: [APML] Sierra Star Trails Question


> Hello -
>
> I was in the Sierra Nevada the week of August 8th and took these star
> trail images. Was at 11,000 feet - a nice dark site. The first image
> was about an hour long exposure and the second about an hour and a
> half. Taken on Fuji 100ASA Superia Print Film. The heavy green
> response in the images was a surprise to me - kind of cool in an odd
> way. I'm curious if others have seen this same effect. Any comments
> are welcome!
>
> Thanks,
>
> Allan
>
>
> http://www.members.cox.net/whetzel/Trails0.jpg
> http://www.members.cox.net/whetzel/Trails2.jpg
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