Magic Lantern Firmware Unlocks the Canon 5D Mark II's A/V Potential

The new Magic Lantern firmware improves audio recording by adding onscreen level meters, disabling automatic gain control, and adding manual gain control—combined improvements that make for the excellent audio you hear in this clip. The new Magic Lanternfirmware enables zebra stripes (they mark the portions of your image that are overexposed) and the various crop marks for 16:9, 2.35:1 and 4:3—the most common aspect ratios that you'll want to shoot.

also see: http://magiclantern.wikia.com/wiki/Magic_Lantern_Firmware_Wiki