Idea of Lens Icon
There is a cylinder and it is on top of a thinner cylinder. There is a small circle on the bottom-middle third of the bigger cylinder, and another thick line goes around the cylinder. The top shows a circle as a lens for a camera.
This page contains the Lens vector icon, as well as variations of this icon in different visual styles, and related icons. All icons are in the flat vector style, however, differ by the line thickness, fill, and corner radius.