Look at above image even it was not a professional design but at least we can say it is good design as well. As what I mentioned in my previouse post. Before you design you might think and understanding the process fromt he beginning till end. In this tutorial you will learn in a easy way to make it like a real one. Sure it take time and many steps to do. But one thing is we only use Ellipse Tool to make it and some other effect. view full tutorial: http://www.m-tutorial.com/2011/02/illustrator-tutorial-make-camera-lense.html