The Vello EXT-MFTD2 Auto Extension Tube Set for Micro 4/3 Mounts and Lenses includes a 10mm and 16mm tube with durable metal mounts including electronic contacts. As a result, when a lens is coupled to a camera body via the tube, it maintains autofocus and autoexposure the same without difficulty. The extension tubes reduce minimum focusing distance, and each tube can be used individually or combined for greater magnification, which enables you to shoot macro photography on insects, plants, and other small objects.