The olympus 14x is a dedicated teleconverter for the olympus ed 40 150mm f28 pro and ed 300mm f4 pro micro four thirds lenses at just 15mm thick the 14x is a great addition to any photographers kit looking to expand the zoom range of their existing telephoto lens lightweight and easily portable the teleconverter features a robust metal cased dust splash and freeze proof build quality to ensure youll always be able to keep shooting in any environment the aperture value will be one s