Features:brand new and high qualityAll metal construction and anodizing aluminium process, durable for long for time use.forOlympus E520, E620Panasonic L1 and other 4/3 bayonet cameras.The auto focusing will not work with this adapter ring. The adapter has no electrical connection and diaphragm & focusing are required to be set by manual.Useful accessory allows you to attach M4/3 cameras to a telescopes, camera adapter, and other astrophotography accessories. Specifications:Material: Aluminum AlloyWeight: 0.03kgSuitable forOlympus E520, E620Panasonic L1 and other 4/3 bayonet cameras. Note:1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes:1x Lens Adapter Ring