Chris, movie crop mode is a feature available on a few Canon DSLR modles. I'm not sure if Nikon have this or equivalent on any of theirs. Basically, it uses the central part of the sensor in video mode, cropping it down to a 640 x 480 pixels thereby enlarging the image.
Despite the low resolution, taking thousands of video frames smooths out the result after stacking. These were the best 70% of about 8000 frames.
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