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I agree with what has been said regarding the supplied 18-55.
At 18mm, there is considerable coma/abberations around the edge of the picture. It's mostly not noticable in daytime terrestrial shots, but i've noticed it in some of mine where straight lines don't go straight near the corners.
See the attached image taken last week, and look in the top left hand corner at the bridge.. the structure gets quite blurry near the edge.
And in star shots it's immediately noticeable.
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