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hark, Yes, that's the one and thanks for the feedback. Again, I would not say it is 'squealing' ..more like it clicks as it AFs from spot to spot - more noticeable than my other lenses. Might be just fine, I'm used to a 55-200mm, and like you mentioned this one is a lot heavier, so maybe, just the bigger optics sliding into place. I am also finding out that I'm unable to hand hold (must be getting old) and get sharp images with any consistency which was my thinking for the purchase. Again, I need to spend more time with it but so far I'm a little disappointed. I'm taking a trip next week to walk the beach so I will put it thru my usual shooting routine and have lots to look at afterwards.