For many years, CCDs had much higher quantum efficiency in the Red than in the blue because the devices were physically thick (200-300 microns of material). In the blue, the absorption depth for photons in silicon is only about 2000 angstroms (1/2 their wavelength) and typically the electrodes are insulated by poly-silicate gates which are around 5000 angstroms thick. ... In what follows, we offer several examples and images taken with wide field CCD systems. Page 3 . ...