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Emy...I would not say a rattling is a normal operation of the lens...you might want to send it to Sigma for a tune-up...if you have a receipt...it should not cost you...if you don't the most I ever paid for this service is about 85USD...
I had a 90mm Macro that did that...it was actually a loose element...the tech told me good thing that it did not get worse...it would have caused other issues...
I would at least call Sigma and find out from them... I will see if works fine when my camera arrives.
Good Luck.... Tony C. :z04_cowboy: