I bought this based on the lens distortion recommendation for my Canon 24-105 f/4L. While this stopped the lens from rolling, it made the zoom extremely narrow, too narrow for my liking. On a lens with a smaller body I see that as a big help, but not on this lens. I bought a 3" ID O-ring, which while not as flat as the lens strip, is much easier to use on the zoom, and the lens is gone.
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