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Message: <blockquote data-quote="BackdoorArts" data-source="post: 160403" data-attributes="member: 9240"><p>The Sigma arrived today.  Really lousy day to go outside and shoot, but I'm happy with what I've been able to get inside (nothing worth sharing, just test shots).  That said, if I'm disappointed with one thing it's the noise from the Optical Stabilizer system.  I've dealt with the one in the 150-500mm, which is loud with a perceptible "clunk" when turning on and off.  While it's a little annoying, I figure for a lens that long it's going to need some significant stabilization.  While the 105's isn't as bad, it's still a lot louder than I would have thought.  I'd seen a video of this in a review of a Canon copy, so it wasn't entirely unexpected.  It'll make it hard to sneak up on bugs, but I was able to get some tack sharp photos handheld at 1/15 sec, so it's doing its job.</p></blockquote><p></p>