These close-up accessories are placed between the camera body and lens to enable high-magnification photography. Eight electronic contact points allow communication between the camera and lens to continue as usual. The magnification differs according to the lens selected, but for standard zoom lenses it is about 0.3X to 0.5X for the EF 12 II and 0.7X or more for the EF 25 II. By using both tubes together, magnification can be extended. Manual focusing is recommended.