gilesco wrote: Dithering will try to move in a random direction, I'm wondering that if your Dec axis is fixed, whether dithering is going to help you, I think it will just give you oblong stars, as the dither can only move in a single axis.
No, why would it create oblong stars? It's not moving during the exposure....
But what usually happens is that RA-only dithering will not be able to remove the 'rain', the stripy appearance coming from fixed pattern noise of the camera. At least you'd need a stronger dithering (larger max), and much more images.
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