Fotodiox New Lens Mount Adapter, Black (Macro-Tube-Auto-FXRF) Designed with all the electrical and mechanical couplings to maintain auto focus and TTL auto exposure No optical insert - maintains Lens optical quality while remaining lightweight Extension tubes are designed to enable a Lens to focus closer than its normal set minimum focusing distance Kit of two extension tube sections: 10mm and 16mm Limited 2-year Manufacturer Warranty