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@Ludd
This chap: http://www.modernastronomy.com/camerasPlanetary.html#QHY5L-II
Mind you, anything dimmer than Jupiter or the moon is going to cause trouble, as there's no way you can get enough light onto the sensor and keep that sort of frame rate. But that Jupiter shot above was averaging about 97fps, which gave me enough frames to stack without the rotation of the cloud patterns causing any smearing.