Megacam is a large mosaic CCD camera with a 24 arcminute square field of view, made up of 36 CCDs with 2048x4608 pixels. Its 0.08 arcsecond pixels offer good sampling at the best seeing. Megacam has a 20 second readout time and 8 filter slots, in addition to in-dewar guiding and focusing. It is available at the Magellan Clay telescope.