The sony fe 55mm f18 za carl zeiss sonnar t lens is the ideal choice for portraiture low light work travel and general purpose photography this dust and moisture resistant e mount lens offers a bright f18 maximum aperture which provides a natural bokeh effect for subjects out of focus sonys fe lenses are primarily designed for sonys full frame e mount compact system cameras such as the a7 and a7r but will also work with the sony nex cameras