This is a tale of two images. These were taken on successive nights.
Same setup, same exposure time, everything.

20080302_M42_20x3min_unguided.jpg

The first night was unguided.

20080303_M42_20x3min_guided.jpg

… and the second night was autoguided with my trusty ST-4.

This was kind of a test of the G-11 Gemini to see how good it could perform without a guider.
The guided image is definitely better. But the unguided one is not too shabby.

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