TheVello Manual Extensions Tube Set for Nikon F-Mount allows your lens to focus closer than its normal minimum focusing distance. By placing distance between your camera body and lens, the focusing distance is shortened and magnification is increased. Extension tubes enable macro performance for lenses not otherwise able to focus that close, and are also suited for close-up portraiture. The Manual Extension Tube Set for Nikon F-mount contains three extension tubes of 7mm, 14mm, and 28mm lengths, as well as dedicated camera mount and lens mount tubes. The extension tubes can be used individually or together in seven distinct combinations to create the desired magnification. For closer focusing use the larger extension tube or stack the tubes together. Extension tubes have no optical elements so do not degrade the quality of your lenses. These tubes are manual tubes and do not communicate electronic functions, such as autofocus or auto exposure control, between your camera body and mounted lens; both manual focusing and manual exposure control must be used. When used with lenses without a manual aperture ring, exposure can only be controlled by changing the camera's shutter speed while maintaining the native preset aperture of the lens (this will be the smallest f/stop on Nikon G lenses). Due to the screw-in design of the manual extension tubes, the lens may not sit directly upright but will, however, function normally. Do not to over-tighten screw-in tubes to ensure easy removal of each tube. Additionally, when using the extension tubes, you will lose the ability to focus to infinity.Shortens minimum focusing distance of lens for macro photography.Extension tubes of 7mm, 14mm, and 28mm lengths can be used individually or in any combination of the three for greater magnification.Lightweight design with metal mounts for durability and longevity.Fits Nikon DSLR cameras and all F-mount lenses.