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I cannot see VR or IS being that sensitive to mirror slap. But if you have mirror flip up then use it for astrophotography. If you don't then you will have to make do. CA? maybe, I was thinking more image shift during the exposures creating a somewhat blurry image or making it look as though a double exposure had been taken. If would only be slight but the image would look soft and you would think the optics were rubbish in an otherwise expensive lens.
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