Canon eos rebel T2i - Manual (Page 128)

k Shooting Movies
128
6
Focus and shoot the movie.
The procedure is the same as steps 2
and 3 for “Autoexposure Shooting”
(p.124).
With manual exposure shooting, AE lock and exposure compensation
cannot be set.
Changing the aperture during movie shooting is not recommended since
variations in the exposure, due to the drive of the lens aperture, will be
recorded.
If you use a lens whose aperture changes while you zoom, you should
not zoom while shooting a movie. Zooming while shooting a movie may
record changes in the exposure.
If you shoot a movie under fluorescent lighting, the movie image might
flicker.
With Auto ISO, the correct movie exposure will usually be obtained even
if the light level changes.
When shooting a movie of a moving subject, a shutter speed of 1/30 sec.
to 1/125 sec. is recommended. The faster the shutter speed, the less
smooth the subject’s movement will look.
If you playback the movie with “Shooting information display” (p.173), the
shooting mode, shutter speed, and aperture will not be displayed. The
image information (Exif) will record the settings used at the start of the
movie shooting.
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