Feature:1. The focusing tube is the best choice for zooming in or changing the lens. It provides a focusing system for lenses without a focusing system.2. Can also be used as a macro tube to provide fine focusing control for macro photography.3. The length of the focal length is 25mm/1in (minimum) to 55mm/2.2in (maximum), provides an adjustment distance of 30mm/1.2in for lens focusing.4. Made of aluminum alloy, black anodized, longer service life, excellent hand feeling.5. The inner wall of the focusing tube is treated with extinction to avoid the influence of reflected light on imaging.6. Use universal M52 and M42 threaded interface, strong versatility, easy to transfer.7. The focusing tube allows the idle old lens to be used for shooting with a digital camera.Specification:Condition: 100% brand newItem type: Focusing TubeMaterial: aluminium alloyColor: blackWeight: Approx. 102g Focusing range: Approx. 25-55mm/1-2.2inInterface: Female port: M52 thread mount Male port: M42 thread mount.Package List:1 xFocusing Tube