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Description: -It moves the lens farther from the film or digital sensor. The farther away the lens is, the closer the focus, the greater the magnification. -This extension tube does not affect image quality as there is no optics inside. In comparison, closes up filters are often blamed for degrading image quality. Features -3 extension tubes: 9mm tube (Tube 1) 16mm tube (Tube 2) 30mm tube (Tube 3) -Made of metal (not plastic); -Color : black Note: When using the extension ring with DSLR / SLR, the camera should be set in the ¡M¡¯ mode. Specification 1.There is no electrical contacts in the extension tubes. Exposure has to be adjusted manually. 2. Aperture control is not available if you use a lens which does not allow you to manually adjust the aperture (without an aperture ring)