Canon EOS 90D, Advanced User'S Manual

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Movie Servo AF
Cautions When [Movie Servo AF] is Set to [Enable]
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Shooting Conditions that Make Focusing Diffi cult
• 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 Diffi cult” on
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146.
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Since the lens is driven continuously and the battery power is consumed, the
possible movie recording time (
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618) will be shortened.
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With certain lenses, the mechanical sound for focusing may be recorded. In
this case, using Directional Stereo Microphone DM-E1 (sold separately) may
reduce such sounds in the movie.
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Movie Servo AF will pause during zooming or magnifi ed view.
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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 magnifi cation).