].
Cautions 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 in front of the camera.
• Also see “Shooting Conditions that Make Focusing Difficult” on page
284.
Since this drives the lens continuously, it will consume battery power and
shorten the total possible movie shooting time (p.309).
With certain lenses, the lens mechanical sound during focusing may be
recorded. If this happens, use a commercially-available external
microphone to reduce the lens mechanical sound in the movie. Also,
using certain USM lenses (for example, the EF-S18-135mm f/3.5-5.6 IS
USM) or certain STM lenses (for example, the EF-S18-55mm f/3.5-5.6 IS
STM) will reduce the lens mechanical sound to be recorded.
Movie Servo AF will pause during zooming or in magnified view.
During movie shooting, 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).
If you want to set the lens’s focus mode switch to <MF> during Movie
Servo AF, first set the Live View shooting/Movie shooting switch to
<A>.
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