Sigma is offering a free upgrade to Canon 40D owners using Sigma’s APO 120-400mm F4.5-5.6 DG OS HSM or APO 150-500mm F5-6.3 DG OS HSM lenses. It has been reported by some users that using one of the lenses mentioned above (120-400mm lenses with a Serial Number lower than 1011001, 150-500mm lenses with a Serial Number lower than 1007001), when 40D is operated in AI Servo AF mode and the OS function is switched ON, the number of continuous frames per second will decrease.

Sigma will upgrade your lenses for free to fix this problem. For further information, Sigma advices you to contact your nearest authorized Sigma Service Station.
http://www.sigma-photo.co.jp/english/network/index.htm

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