This extension tube is designed for macro , it is made of qualified ABS , and copper contact. It perfect matches with single lens reflex camera, and support automatic focus.It is mount lens to at closer distance with higher magnification. The adapters consists of 2 rings of different lengths which can be single used or be used in combination.Since the magnification changes according to the length of the lens, you can make -up of small subjects. It enables you to use all modes of the camera, exposure compensation is required.Extension tubes are designed to enable a lens to focus closer than normal set minimum focusing distance. closer has the effect of magnifying your subject while maintaining optical quality.When using the extension tubes alone: 10mm or 16mm, or use in combination : 10mm+16mm=26mm, the length of lens should be the length of the tube.1. Support precise TTL exposure and auto focus function;2. Built-in electronic PIN pin and driver;3. Applicable for Mini single E-mount NEX series cameras, support full frame;4. Advanced plastic material, stable and ;5.It consists of two sets of different lengths of rings (10MM, 16MM), three different combinations of modes;6. Incorporate the latest upgraded circuit , which is more convenient for use during macro ;7. The high-grade locking bayonet makes the joints tighter and ;8. Create -up results;9. and stable;Compatible Camerafor E\/FE NEX3 NEX5 NEX6 NEX7 A5000\/A6000\/A7\/A7M2 SeriesDiameter: . 6cm \/ 2.3inchHeight: . 4cm \/ 1.5inchTube Length: 10mm+16mmColour:blackMaterial:MetalPackage Contents:1x Auto Focus Macro Extension TubeOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.