By reducing the minimum focusing distance of Sony E lenses, Viltrox's Automatic Extension Tube Set also allows you to achieve greater maximum magnification for close-up shooting with any lens. This kit includes 10mm and 16mm tubes, which can be used independently or in combination for up to three different lengths to fit different types of subjects. In addition, the built-in copper-coated contacts maintain full autofocus and automatic exposure functionality, and each ring features durable Sony E mounts on the front and back.