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Message: <blockquote data-quote="canonman77" data-source="post: 1243890" data-attributes="member: 67900">HI Martin Thomas, with regards to the FRAMES PER SECOND Issue, The Information Is taken from sigma-photo.co.jp & what It says Is this: -When the Canon 40D digital slr Is In AI SERVO AF mode & the SIGMA 150-500 or 120-400 lenses are attached to the camera with the OS function switched ON, the number of FRAMES PER SECOND will decrease. To overcome this, we (meaning Sigma) will start supplying a free-upgrade service to customers. If the SERIAL NUMBER on the 150-500mm (Canon fit) Is lower than 1007001 then It will be affected, If Its higher then It should be ok. If the serial number on the 120-400mm Is lower than 1011001 then It will be affected & so on. I myself am waiting for the 150-500 & Sigma & warehouse express have assured me that any new batch of the 150-500mm will be fixed & WONT require any upgrade... For further Info go to sigma-photo.co.jp.Sean..</blockquote>