Auto-Focus Macro Extension Tube Set for Nikon D300, D300S, D600, D700, D800, D800E, D3000, D3100, D3200, D5000, D5100, D5200, D5300, D7000, D7100 DSLR Camera & an eCostConnection Microfiber Cloth Designed to enable a lens to focus closer than its normal set minimum focusing distance. Magnifying your subject (making it appear larger in the viewfinder and in your pictures) Tube Set Includes: 12mm, 20mm, & 36mm extension tubes Designed with all the circuitry and mechanical coupling Lightweight design Tubes can be used individually or in any combination to obtain the desired magnification