Fotodiox New Lens Mount Adapter, Black (Macro-Tube-FXRF) Any combination of tubes can be Used for Various Reproduction ratios 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 Includes: camera and Lens mounts & 7mm, 14mm and 28mm extension tube sections Limited 2-year Manufacturer Warranty