That's not really too positive if your recommendation is to stop it down to f/5.6 to get round stars. Doesn't that make it as slow as the 18-55 kit lens for astrophotography ?
Do you have any other lens reviews to compare against ? The links at the top of the page go to this review and I'm sure you will have looked at other lenses since the "Catching the Light" summary.
Steve.
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