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Tracking or guiding??
The attached image is an extract from a full frame Canon D1000, 1 min image with no tracking or RA drive. The length of the trail is in RA.
The interest is the fact that although the bright star was slightly out of focus (to focus on the spectrum being obtained) the track shows the amount of atmospheric movement recorded over a one min period.
The Air Mass at the time was around 1.6
Good tracking would have compressed this wobbly line, hopefully into a "blob" which contains the extreme edges....good guiding, it is hoped, would effectively follow this "wobble" and result in smaller rounder images.
An interesting exercise.
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