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I have just upgraded from the non IS 70-200/4 to the IS version and was just checking on the noise from the IS sytem. The IS noise itself is of no concern as I know it is nosier than many of today lenses but similar to the 300/2.8 that I had. Is it normal to hear a higher pitched click when the IS first turns on and then when it finally turns off? Just wandered because I have not heard this on any of my other IS lenses.