The panasonic 25mm f17 lumix g asph lens delivers a beautiful bokeh background effect for shooting creative portraits the fast f17 aperture encourages handheld shooting without a flash in dimly lit environments and allows the true atmosphere of a scene to be captured in crisp clear detail the lens provides a 50mm focal distance 35mm camera equivalent similar to that of the human eye when mounted on a micro four thirds camera and takes advantage of panasonics 240fps contrast detection af