Jrifedptry Macro Extension Tube Ring for M42 42Mm Screw Mount Set for Film/Digital SLR Camera Adapter

Use this set not downgrade the optical quality of your lens. This new Macro Extension Tube Set for your film & Digital SLR includes 3 extension tubes - 9mm, 16mm, 30mm adapters. 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.