Macro Extension Tube 3 Ring L8D Set Adapter For M42 42mm Screw Mount Camera Lens Description:   * To provide additional extension、 one or more extension tubes can be added between the camera and the lens、 to make the lens focus at closer distances and therefore produce higher magnification. * This Macro Extension Tube Set for your film !#!amp!*!amp; Digital SLR includes 3 extension tubes - 9mm、 16mm、 30mm adapters. * Use this set will not downgrade the optical quality of your lens. Sharpness and Saturation can be still maintained. But they are not meter-coupled. They do not preserve the automatic diaphragm. It should be used with manual lenses with their own aperture dial. There is no electronic connection between the body and the lens. Automatic lenses can be used with their widest open aperture only. Material: Metal   Package Included:   1 x Macro Extension Tube Ring M42  Detail Pictures: