this invention relates to a media exposing device for exposing media . the media exposure device includes a holding structure ; a substrate having a plurality of diodes mounted thereon ; and a radiation modification element for modifying the radiation emitted by the diodes . the substrate and the radiation modification element are secured by the holding structure in an arrangement wherein the diodes can emit radiation from the device and wherein the radiation modification element is spaced from the diodes in the radiation path of the diodes ; and a telecentric lens secured to the holding structure in an arrangement wherein the telecentric lens is substantially in register with the radiation path of the diodes .