Fotodiox Macro Extension Tube Set for Sony Alpha A-Mount (and Minolta AF) Mount SLR Cameras for Extreme Close-up Photography 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 24-Month Fotodiox warranty