An apparatus is adapted for confocal imaging of a non-flat specimen, and includes a light source for producing a light beam, imaging optics adapted to focus the light beam into at least one spot on a surface of a specimen, and a detector adapted to receive and detect light reflected from the specimen surface. The light source includes an optical system for converting a coherent beam into a plurality of beams, each of which is modified by a moving diffuser within a range of movement that is correlated to the detector's integration time.