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Message: <blockquote data-quote="john*thomas" data-source="post: 285948" data-attributes="member: 16937">If you look you can find the Sigma for $300 new. I don't know but I wouldn't think you would need this big of range at Disneyworld. At the low price I have one for general walking around. I'll live with some limitations as opposed to tramping around in the woods with a $1000 lens. I also hate swapping a lens while out.   It is slow to focus on fast moving objects. For normal focus I've noticed no difference than any other lens. It's actually better than I expected in low light.</blockquote>