Canon has issued a new firmware update (Version 2.0.7) for its EOS 5D Mark II HD DSLR, mainly fixing a couple of exposure problems.
It fixes a problem where the aperture exhibits abnormal movement when shooting movies in manual exposure mode and Aperture Priority AE (Av mode) using some Canon lenses (such as macro lenses). This involves the aperture of the lens changing when the focusing ring is moved (during focusing). This sort of behaviour is often seen on zoom lenses with variable maximum apertures, where the aperture can change during zooming, but shouldn't happen during focusing.
The other exposure problem applies to stills photography (where the exposure information shown in the LCD didn't match what was shown in the viewfinder in manual exposure mode.) The update also fixes a problem with Canon's Wireless File Transmitters.
It is available here: http://web.canon.jp/imaging/eosd/firm-e/eos5dmk2/firmware.html
By David Fox
The fix is only for firmware version 2.0.3 and 2.0.4.
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