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A screw dropped from EF 17-40

Started Oct 11, 2021 | Questions thread
Aoi Usagi Veteran Member • Posts: 3,221
Re: A screw dropped from EF 17-40
3

It looks to be a cammed roller / guide so the internals parts move in a certain direction and a certain distance.  You may be able to get away with using the lens without it, but I highly recommend getting the lens serviced.

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