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Aurora time lapse, originally uploaded by fyngyrz.

This is 40 still frames from my EOS50D, taken the evening of the onset of the April 3-4-5-6 geomagnetic storm, all from the same point and with the same camera settings. I used Canon’s 50mm ƒ/1.4 lens, wide open, after manually focusing it on a star. All these shots were taken at ISO 3200, 4 seconds exposure, then combined using the Mac’s movie software and converted from .dv to .mp4 using Handbrake, and from thence to flickr.