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I think your 60mm Macro (or just about any prime lens) would be a better choice for a-p.
Even top-notch 'L' zooms often give soft or blurry results on starfields.
Some results can be seen in the book, "The Backyard Astronomer's Guide" (p.279 ), by Dickinson & Dyer.
Quite a useful chapter on a-p actually!
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