As a walk-around lens, this design from the Sigma stable scores well over the normal offering of ‘kit’ lenses, giving extended focal length at the long end and improved performance at the wide end. The reduced need for lens changes on the digital SLR’s that it is made for ensures less chance of the dreaded dust getting at the sensor whilst, at the same time, the light weight and compact size will reduce neck ache after long days carrying it around.