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Canon EF 70-200 F/4 IS USM - Amazon Trade-in: loose cylinder & Rattle

Started Nov 7, 2015 | Discussions thread
Steve Balcombe Forum Pro • Posts: 15,582
Re: Canon EF 70-200 F/4 IS USM - Amazon Trade-in: loose cylinder & Rattle

RogerZoul wrote:

Steve Balcombe wrote:

The problem - not necessarily with your lens, but in general - is that if you remove the lens from the body before the IS system has powered down, it can leave the IS group unparked and free to rattle around. It can be quite disconcerting, but if you then attach it to a body and power up, it immediately works perfectly.

Maybe the 'inspector' attached it to a body, checked that it was working (it was), then working quickly they removed it and shook it - whereupon it rattled.

That is very believable..I'm certain I didn't know that...but I wonder why he would do that if he knows the group could become unparked?

Under pressure to work quickly I guess. And presumably not knowing that this happens. We already know the person who inspected the lens wasn't competent, otherwise why reject a perfectly good lens?

Do you know if Canon has any written description of this on a website?

That's a good question, I can't remember where I got it from. Maybe somebody else reading this will know?

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