Figure: Examples of galaxies of various surface brightness. At top left is the Messier object M51, a typical high surface brightness spiral galaxy. To its right is UGC 12522, a galaxy with a bright central core yet faint ((0) = 23.1 mag arcsec) spiral arms. On the bottom left is C9-1, which, with its amorphous shape is a typical LSB galaxy ((0) = 23.9 mag arcsec). Finally, on the bottom right is P2-4, a galaxy which could not have been detected without a low noise detector (in this case a 2048 x 2048 CCD) and which appears to be composed of loosely connected blobs (0) = 25.5 mag arcsec).