Following the success of the Canon Hack Development Kit (CHDK) for Canon's Power Shot cameras, third party firmware was also produced for the 5D Mark II.The Magic Lantern firmware provides many additional video and cinematography related controls and meters such as false colors, and zebra stripes for exposure control, depth of field estimates via peaking filters, audio VU meters and disables the automatic gain control on the microphone input (although some of these features have since been added to Canon's official firmware, as noted above).

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Originally, the camera lacked manual control when filming video.

On 2 June 2009 version 1.1.0 of the firmware was released which provided control over aperture, shutter speed and ISO while recording video.

The camera has native ISO values of 100 multiplied by a power of 2; other ISO values are obtained by a digital exposure push (ISO values that are multiples of 125) or digital exposure pull (ISO values that are multiples of 160).

The digital exposure push ISO is 1/3 stop greater than the native ISO, and a digital exposure pull ISO is 1/3 stop less than the native ISO.

On 17 March 2010 the firmware was found to have some bugs with the audio functions and thus retired.

Fixes a phenomenon where shooting stops after capturing one image when in continuous shooting mode or auto exposure bracketing (AEB) continuous mode.

Cpl Mark Magness (right) and another officer are seen on surveillance footage telling suspect Kent Lasnik not to resist while Magness hits him 12 times.

The Canon EOS 5D Mark II is a 21.1-megapixel full-frame CMOS digital single-lens reflex camera made by Canon, the first Canon EOS camera to have video recording capabilities.

Recent nightly builds have even managed to provide a stable output of uncompressed 14-Bit RAW video data onto fast UDMA 7 CF cards at almost HD resolution (1004p vs. Although the size of the files and high price of appropriate cards are considered moderate drawbacks and the 5D Mark III generally shows better performance regarding RAW video, the Mark II, being the oldest among them, still remains to be the next best among reasonable choices for DSLR RAW video output and showcases thus, that uncompressed HD RAW video on a DSLR was already theoretically possible with technology of the year 2008.

Notable film and television productions that used the Canon 5D Mark II include (in order of release): Several aftermarket vendors have developed professional video accessory packages, to take advantage of the large 35mm sensor, which provided cinema-like depth of field. For 3D video shooting Anachrome 3D is offering several dual camera mount packages, which make use of several short focal length Canon prime lenses.

Sync issues are also addressed in these 3D packages, with a "sync comparator" as "gen-locking" two 5DM2s is not readily do-able at this early stage.