Thanks Bert for the extra info. I'll have to do further research. I've had my eye on the canon 24-105mm f/4 L IS or non-IS (so perhaps no issues with the IS version if you and others haven't experienced problems), the 70-200mm f/4L (IS or non-IS) or alternatively the 70-300mm f/4L (IS or non-IS). I here the 70-200mm is a great astro performer for a zoom.
Cheers
Steve
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