Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 253)

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z Movie Servo AF
With this function enabled, the camera focuses on the subject
continuously during movie shooting. The default setting is [Enable] .
When [Enable] is set:
- The camera focuses on the subject continuously even when you are
not pressing the shutter button halfway.
- If you want to keep the focus at a specific point or if you do not want
the lens mechanical sound to be recorded, you can temporarily stop
Movie Servo AF as follows.
• Tap [ Z ] on the screen’s bottom left.
• Under [ 5 : Custom Functions(C.Fn)] , if [Shutter/AE lock
button] is set to [2:AF/AF lock, no AE lock] , you can pause the
Movie Servo AF while holding down the <
A
> button. When you
let go of the <
A
> button, Movie Servo AF will resume.
- When Movie Servo AF is paused, if you return to movie shooting
after operations such as pressing the <
M
> or <
x
> button or
changing the AF method, Movie Servo AF will resume.
When [Disable] is set:
- Press the shutter button halfway to focus.
Cautions When [Movie Servo AF] is Set to [Enable]
z 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.
- For details, see “Shooting Conditions that Make Focusing Difficult”
( = 202).
z Since the lens is driven continuously and battery power is consumed, the
possible movie shooting time will be shortened.
z With certain lenses, the mechanical sound for focusing may be recorded. In
such a case, using Directional Stereo Microphone DM-E1 (sold separately)
may reduce such sounds 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/4-5.6 IS STM) will reduce the lens mechanical
sound that is recorded.
z Movie Servo AF will pause during zooming or magnified view.
z 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).
z If you want to set the lens’s focus mode switch to < MF > during Movie Servo
AF, first set the camera’s power switch to < 1 >.