Auto Focus AF Macro Extension Metal Tube 13MM 21MM 31MM For Canon EOS Lens

Auto Focus AF Macro Extension Metal Tube 13MM+21MM+31MM For Canon EOS LensFeatures:1. AF Extension Tube Set can transform your Lens into a Macro Lens.2. It comes as a set of tube of different lengths which singly or in combination makes it usable in 3 different lengths.3. The extension tube does not affect image quality as there is no optics inside.4. This Extension tube couples perfectly with the cameras automatic diaphragm.5. With cameras of TTL, AE(Through-the-lens,Automatic Exposure) type it gives perfect coupling except when combined with electronic flash AE unit.6. 
Eetension tube for Canon EOS mount is an accessory designed for use with EOS mount lenses to shoot at closer distance with higher magnification.7. But depending on the shooting conditions, exposure compensation is required.Notice:1.Please allow 1-5mm error due to manual measurement.Please make sure you do not mind before you bid.2.The colors may have different as the difference display, Please understand.Specifications:Material: Metal(Mount)/ABS(Body) 
Color: BlackTube diameter: about 62mm
Tube
 Length: 8.1cm(total)
Tube consists of 3 parts:
12mm Tube/20mm Tube/36mm TubeSuitable for Canon EOS LensPackage Included:1 * Metal Extension Tube(13mm+21mm+31mm) Set1 * Bag1 * User Manual