This Macro Extension Tube Set for film and digital SLR cameras includes three extension tubes: 9mm, 16mm, and 30mm adapters. Using this set will not degrade the optical quality of your lens. Sharpness and saturation can be maintained. The tubes are not meter-coupled and do not preserve the automatic diaphragm function. They should be used with manual lenses that have their own aperture dial. There is no electronic connection between the camera body and the lens. Automatic lenses can only be used at their widest open aperture. When using the extension tubes with a DSLR or SLR camera, the camera must be set to 'M' (Manual) mode. Color: Black Material: Metal Package Contents: 1 x Macro Extension Tube Ring Note: The package includes only the items listed above. Other products are not included. Note: Light reflection and differences in display screens may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement error allowance is +/- 1-3 cm.