kenko auto extension tube set dg 12mm, 20mm, and 36mm tubes for nikon af digital and film cameras aexrubedgn

You will receive  -1x 12mm extension tube, weight 2.5oz (72g) -1x 20mm extension tube, weight 2.9oz (84g) -1x 36mm extension tube, weight 3.9oz (112g) - Lens cover as shown Extension tubes are designed to enable a lens to focus closer than its normal set minimum focusing distance. Getting closer to your subject will magnify its size. They are very useful for macro photography, allowing you to convert many lenses into a macro lens at low cost which maintaining its original optical quality. The DG extension tubes have no optics. They are mounted between the camera body and lens to create more distance between the lens and film plane. By moving the lens further ways from the camera film or CCD sensor, the lens will focus closer to the subject. The greater the extension tube length, the closer the lens can focus. Note: 1. When using the extension tube, the lens will not focus to infinity. The focus range is limited to very close focusing distance. 2. Sometimes the equivalent of 3 F-stops of light is lost when using multiple extension tubes together. The light lost will affect the camera's ability to auto focus. Use manual focus is recommended in this case. 100% Authentic and Brand new in retail package Specifications:  Designed to enable a lens to focus closer than its normal set Very Useful for Macro Photography The Extension Tubes have no optics Focus Closer to the objects you see and enjoy the feel of photography Auto Extension Tube Set for the Nikon AF Mount Supported Sensor Size APS-C, Full Frame Technical Details:Size: NikonPackage Dimensions: 3.8 x 2.8 x 2.7 inchesItem Weight: 7.2 ouncesItem model number: 2042