I bought the intermediate rings in addition to my macro lens, because I do not want to lug it every time. The intermediate ring is easily and quickly mounted and has in any pocket. I had him on the EOS 7D in use. Everything funzt properly. The ring is easy to install and will not budge. The processing makes a very good impression. When you combine multiple, you should switch to Manual focus because the camera does very difficult to focus. I myself turn in macro anyway the focus from, because I'd rather put the focus point yourself. At the Canon 500 D Macro lens rings not come but ran. Here the focus is working better and you have more light available. The only drawback here is, the lens must have the respective filter diameter, while the rings fit anywhere.
