1. The adapter ring is also the same as the basic close-up adapter ring principle, and adopts 13mm, 21mm and 31mm three specifications to form an adapter ring group, which is connected to the lens to form a macro lens 2. The three specifications of the adapter ring can be directly connected to the lens and the body, and the adjustment range of the 4.2cm~21cm focus distance can be achieved through 7 combinations (as the initial purpose of the macro lens has been achieved), 0.24~1.47 Magnification 3. The built-in gold-plated electronic contacts retain the auto focus function of the body, which can achieve mechanical focus, and the focus range is 0.3cm~5cm 4. Keep the automatic metering function, can realize the three-speed exposure compensation, and realize the predictability of the exposure value of the shooting 5. When in use, it is attached between the body and the lens like a teleconverter, such as: a combination of three adapters, and the image-to-object ratio for a 50mm standard lens is 1:1 6. However, the focus range of the lens will be limited as the adapter ring increases. Therefore, when shooting with the adapter ring combination, you need to move the camera or the front and back distance of the subject to focus, and the shooting effect is basically the same as the close-up skin cavity. 7. The advantages of the close-up ring are small size, light weight and easy to carry 8. The structure of the adapter ring is extremely simple and generally not easy to damage 9. According to the different combinations of the three branches, different magnifications can be achieved 10. Use the close-up ring to reproduce the documents, take pictures of flower stamens, jewelry, and take some small things very well 11. Weight: about 100 grams 12. Size: about 12 cm