“Showcase” image of the field around the bright radio source 3C 147, produced after reduction with MeqTrees. The image is noise-limited, and has a dynamic range of 1.6 million. This DR was already achieved by de Bruyn using regular selfcal in NEWSTAR, but the resulting images contained artefacts around off-axis sources (left inset) due to DDEs. A MeqTrees reduction incorporating differential gains, as described in this paper, has completely eliminated the artefacts (right inset). This image also appears in Noordam & Smirnov (2010).