Neewer&reg; Aluminum Alloy Metal Bayonet Auto Focus Macro Close-up Extension Tube Set 10mm,16mm for Micro Four Thirds (Micro-4/3, MFT) Mirrorless Cameras,fit Panasonic GF5 GX1 GX2 Olympus EM-P2 EMD Extension tube made of Aluminum Alloy,dedicated for Panasonic Olympus Micro Four Thirds (Micro-4/3, MFT) Mirrorless Camera. Feel the beauty in macro shooting! Two tubes(10mm,16mm) can be mounted in three combination for different needs of macro shooting. Electronic contacts to build up better conductions,allowing auto focus and exact support of TTL exposure to help you in your photography. With the metal bayonet,they can fit snugly and smoothly to your camera and lens minimazing abrasion to the mount Easy to set up, simple to use,lightweight to carry around.