XCSOURCE&reg; Macro Extension Tube for Sony E-Mount NEX-3 NEX-6 NEX-5R NEX-7 A7S A7R A7 LF434 This Macro Extension Tube Set includes 2 extension tubes:10mm,16mm. You may mount the tubes between lens and camera body to get your choice of macro ranges. There are totally 3 combinations. 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. It is with electronic contacts, which make it support automatic focusing, automatic exposure, etc. It enables you to use all shooting modes of the camera, exposure compensation is required.