Canon EOS 5D Mark III Instruction Manual page 228

k Shooting Movies
Notes on Movie Shooting
The camera cannot autofocus continuously like a camcorder.
Autofocusing during movie shooting may momentarily throw the focus far
off or change the exposure.
During movie shooting, do not point the lens toward the sun. The sun's
heat can damage the camera's internal components.
Under [51: Record func+card/folder sel.], even if [Record func.] is set
to [Rec. to multiple] (p.118), the movie cannot be recorded to both the
CF card <f> and SD card <g>. If [Rec. separately] or [Rec. to
multiple] is set, the movie will be recorded to the card which has been
set for [Playback].
If <Q> is set and the ISO speed or aperture changes during movie
shooting, the white balance may also change.
If you shoot a movie under fluorescent or LED lighting, the movie may flicker.
Zooming the lens during movie shooting is not recommended. Zooming
the lens can cause changes in the exposure regardless of whether the
lens' maximum aperture changes or not. Exposure changes may be
recorded as a result.
Cautions for movie shooting are on pages 247 and 248.
If necessary, also read the Live View shooting cautions on pages
217 and 218.
Movie-related settings are under the [z4] and [z5] tabs (p.243). In the
<A> mode, they are under the [z2] and [z3] tabs.
A movie file is recorded each time you shoot a movie. If the file size
exceeds 4 GB, a new file will be created.
The movie image's field of view is approx. 100% (with movie recording
size set to [A]).
You can also focus the image by pressing the <p> button.
To focus during movie shooting, press the <p> button. You cannot
focus by pressing the shutter button.
Under [z5: Movie shoot. btn], if [V/
shutter button completely to start or stop the movie shooting (p.244).
Monaural sound is recorded by the camera's built-in microphone (p.220).
By connecting a stereo microphone (commercially available) equipped
with a 3.5 mm mini plug to the camera's external microphone IN terminal
(p.19), stereo sound recording is possible.
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] is selected, you can press the