Vivitar Auto Extension Tube Set for Olympus OM Cameras, set of three tubes 12mm, 20mm and 36mm in length, can be used individually or in combination with each other, the deeper the extension the closer to the subject you will get and the smaller the area you will photograph, meter coupled between the lens and the body for accurate light metering, in good condition with caps and hard case.

Ref S343 (4)