To achieve a blurry background or a bokeh effect you need a lens that has a wider aperture, like the prime 50mm f/1.8 or the 35mm f/1.8 lenses. They both have a wider aperture i.e. f/1.8 and the expensive ones even have more wider upto f/1.4 and f/1.2. The other prime 85mm f/1.8 and tele…