I had the problem that my Canon EF 28-70mm f / 3.5-4.5 II cap supplied always only difficult it was and continuously dropped since the 52mm thread disappears when zooming in the lens, but the cap on the edge the lens tilted and fell. With the new cap I have the problem but now that she is no longer smaller than the outer diameter of the filter thread and simply disappears with the filter thread inside the lens. Practically this is also the internal handle of the lid. So you can take it off at any position of the lens. Price and shipping were as usual good.