‘First Light’ on-sky 566 s exposures. Top: the full VIS mosaic of 36 detectors, after stray light avoidance measures were taken. It is shown on a log intensity scale with the intensity range shown in the grey-scale bar below the mosaic. To display it, pixels have been binned 12×12 into super-pixels to create a 2k×2k image but otherwise it is unprocessed. Bottom: the third CCD from the left-hand-side in the top row of the mosaic displayed at full resolution, again unprocessed. In addition to stars (evident from their diffraction spikes), star clusters, and galaxies, there are numerous cosmic ray events, some seen as extended streaks depending on their angle of incidence, and also optical ghosts, the most prominent of which is half way up on the left hand side.