eCostConnection Auto-Focus Macro Extension Tube Set for Sony Alpha A7R, A77II, A7S, SLT-A58, SLT-A77, SLT-A65, SLT-A58, SLT-A77, SLT-A65, SLT-A99 DSLR Camera & a 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