Extension tubes are a perfect solution to allow ultra close focusing without sacrificing the optical properties of your lens. ProMaster Macro Automatic Extension Tubes are engineered for a precise fit and proper communication between your camera lens and body. The ProMaster 8812 Automatic Extension Tube Set for micro 4/3 mount (works with Olympus, Panasonic, and many other brands using m43 mount) includes two tubes (10mm and 16mm) that can be used individually or in combination to gain the right magnification for your particular need. Protective dust caps and a handy neoprene storage case are also included in this premium kit. These tubes maintain full electronic communication between your camera and lens. Functions such as AF, metering, etc... are kept intact.