Hi Derek,
I've downloaded and installed the latest version of Magic Lantern firmware on the 600D. It allows for video frame rates of down to 0.2 frames/sec with the corresponding 5 sec exposure time. Sensor noise is a big issue at these setting but as you can see the results can be worth it. I set up the camera and press record. With 2 batteries the video can go for about 3.5 hours and at this frame rate it's only about 1.7 Gb of space. Not tracked.
Cheers,
Tom
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