I wondered the same thing about my Sigma 70-200 f/2.8 HSM (circa 2005) and it works great! Hopefully others won't experience too many issues.
Copyright © Nikonians 2000, 2014
All Rights Reserved
Nikonians®, NikoScope® and NikoniansAcademy™ are trademarks owned by Nikonians.org.
Nikon®, Nikonos® and Nikkor® are registered trademarks of Nikon Corporation.