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You will only be dissapointed with any zoom to image stars,chromatic abberration and coma are both very apparent.All zooms have to have compromises in their inherent design.Sure the really short focal length zooms dont show this as their images are bloated anyway.
The only lenses to consider for astrophotography is a high quality prime of any quality brand.
I have a Tamron 90mm F2.8 macro which is very good.A canon 85 mm F1.8 which is also very good.A Tokina 24 to 200 mm which is lousy at stars,but fine with ordinary low contrast images.
Just because a zoom produces good terrestial images,does not mean it will image stars without chromatic abberration and or coma (spherical abberation).
If I am wrong about Canon L zooms let me know.
If you want pics let me know.
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