The Kenko Tussenringeset is a set of 3 rings that you place between your camera and lens. This increases the distance of the lens to the sensor of your camera. This has a number of consequences. Your lens now has a larger magnification factor. You can make a simple calculation. The length of the intermediate ring divided by the focal length is the extra magnification obtained. In addition, the minimum focus distance to the product is smaller. The Kenko Tussenringeset is therefore ideal for the macro photographer. The set consists of rings of 12, 20 and 36mm. The autofocus is not affected by the intermediate ring.
Note: This set works with Nikon lenses.