> Another reason this is often done is to improve signal-to-noise ratio in
the
> final image. A single twenty minute exposure is going to be degraded to
> some extent by twenty minutes of atmospheric turbulence, scattered light
> from cars passing in the distance, etc. By shortening the duratio
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From: "Peifer, William [OCDUS]" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, June 29, 2001 6:39 AM
Subject: RE: Comet Picture Question
> Tom C. (aimcompute) inquired thus about stacked astro-exposures:
> > The picture credits at the above link
Tom C. (aimcompute) inquired thus about stacked astro-exposures:
> The picture credits at the above link says the image is a combination
> of 4 exposures totaling 20 minutes.
> I was wondering why, but came up with the reciprocity failure issue as
> I was writing this. Is that the reason? Does
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