Features: The M42 close-up adapter can be used for remakes. It is divided into three adapters. The adapter is placed between the SLR body and the lens, and can be combined arbitrarily to obtain the required magnification. There are three sections in total, which can be used alone or together, but the aperture cannot be linked. The three sections are 7mm, 14mm, and 28mm, respectively, and can achieve 1:1 magnification with a 50mm header. The conversion formula is: magnification = the length of the adapter ring / the focal length of the lens. According to this, multiple adapter rings can also be combined to match different lenses to achieve the required close-up effect. The close-up ring of the M42 mount can turn an ordinary lens into a macro lens. Specifications: Material:Aluminum Applicable lens: M42 Color: Black Applicable models: Mirrorless camera Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x 7mm Tube 1x 14mm Tube 1x 28mm Tube