Features: This extension tube is designed for macro shooting, it is made of qualified plastic, alloy and copper contact. It perfect matches with Canon EOS camera, and support automatic focus. It is mount lens to shoot at closer distance with higher magnification. The set of adapters consists of 3 rings of different lengths which can be single used or be used in combination. Since the magnification changes according to the focal length of the lens, you can easily make close-up shots of small subjects. It enables you to use all shooting modes of the camera, exposure compensation is required. Extension tubes are designed to enable a lens to focus closer than its normal set minimum focusing distance. Getting closer has the effect of magnifying your subject while maintaining its original optical quality. When using the extension tubes alone: 31mm or 21mm or 13mm, or use them in combination: 31mm+21mm+13mm, the focal length of lens should be greater than the length of the tube. Specifications: Condition: 100% Brand New and High Quality Material: Plastic + Alloy + Copper Diameter: Approx. 6.8cm / 2.6inch Height: Approx. 7cm / 2.7inch Fit Camera: for Canon EOS Tube Focal Length: 31mm+21mm+13mm Weight: Approx. 171g Packing List: 1 x Lens Extension Tube Set 1 x User Manual 1 x Storage Bag * The camera is not included. 1、This extension tube is designed for macro shooting, it is made of qualified plastic, alloy and copper contact. It perfect matches with Canon EOS camera, and support automatic focus. 2、It is mount lens to shoot at closer distance with higher magnification. The set of adapters consists of 3 rings of different lengths which can be single used or be used in combination. 3、Since the magnification changes according to the focal length of the lens, you can easily make close-up shots of small subjects. It enables you to use all shooting modes of the camera, exposure compensation is required. 4、Extension tubes are designed to enable a lens to focus closer than its normal set minimum focusing distance. Getting closer has the effect of magnifying your subject while maintaining its original optical quality. 5、When using the extension tubes alone: 31mm or 21mm or 13mm, or use them in combination: 31mm+21mm+13mm, the focal length of lens should be greater than the length of the tube.