Canon EOS 5D - Manual (Page 83)

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5
Advanced Operations
In shooting modes other than <1> (Full Auto), you
can freely set the shutter speed or aperture to obtain
the desired result.
The asterisk M appended on the right of the page title
indicates that the respective feature cannot be changed in
the <1> (Full Auto) mode.
After you press the shutter button halfway and let go, the
timer operation will keep the LCD panel and viewfinder
information displayed for about 4 sec. (0).
First set the <4> switch to <J>.