Canon EOS 5D Mark IV L-series Zoom Lens Kit オーナーマニュアル

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Depending on the scene, positioning the subject toward the left or right 
to include a balanced background will result in a picture with better 
perspective.
In the <A> mode, pressing the shutter button halfway to focus on a 
still subject will lock the focus on that subject. Recompose the shot 
while keeping the shutter button pressed halfway, and then press the 
shutter button completely to take the picture. This is called “focus lock”.
In the <A> mode, if the subject moves (distance to camera changes) 
during or after focusing, AI Servo AF will take effect to focus on the 
subject continuously. (The beeper will continue beeping softly.) As long 
as you keep the Area AF frame positioned over the subject while 
pressing the shutter button halfway, focusing will be continuous. At the 
decisive moment, press the shutter button completely to take the 
picture.
A
 Full Auto Techniques (Scene Intelligent Auto)
Recomposing the Shot
Shooting a Moving Subject