Much as I like my Pentax digital SLR camera I'm not overly impressed by what photographers (the ones who refer to lenses as 'glass') call the 'bokeh' of the 18-55mm lens that came with it. The bokeh is the blurred effect in the background when you use a wide aperture to create a shallow depth of field. Compare the above image with the more subtle effect of my beautiful old Pentax 50mm manual lens here.