Learn to capture a special blur in your photos – bokeh. Bokeh is the out-of-focus parts of an image produced by a lens. It isolates your subject from your background and is achieved with very shallow depths of field. Lenses that shoot with wider apertures (wider than f/4) more easily create beautiful bokeh. Lenses with wide maximum apertures not only create great bokeh but also let in tons of light – a great trait for low light situations.