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Logan,
There is nothing fundamentally wrong with your image IMO, focus is as good as it can be for the lens used (can you tell us what gear you were using?).
I think the dim star images are not the same shape in centre and corners of the images, maybe the lens suffers from astigmatism (which shouldn't be a surprise as it is obviously a multipurpose camera lens (it has IS)).
Maybe you should try non-IS lens, perhaps some prime focus lens (they are generally better than zooms)
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