Canon EOS REBEL T8i, Advanced User'S Manual

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Caution
Precautions when [Movie Servo AF] is set to [Enable]
Shooting conditions that make focusing difficult
• A fast-moving subject approaching or moving away from the camera.
• A subject moving at a close distance to the camera.
• When shooting with a higher f/number.
• Also see
Shooting Conditions That Make Focusing Difficult .
Since the lens is driven continuously and the battery power is consumed, the
possible movie recording time (
) will be shortened.
The camera's built-in microphone will also record mechanical sounds of the lens or
sounds of camera/lens operations if AF operations are performed or the camera is
operated during movie recording. In this case, using an external microphone may
reduce these sounds. If the sounds are still distracting with an external microphone,
it may be more effective to remove the external microphone from the camera and
position it away from the camera and lens.
Movie Servo AF will pause during zooming or magnified view.
During movie recording, if a subject approaches or moves away or if the camera is
moved vertically or horizontally (panning), the recorded movie image may
momentarily expand or contract (change in image magnification).
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