Canon T5 사용자 설명서

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Autofocus can fail to achieve focus (viewfinder’s focus confirmation light 
<o> blinks) with certain subjects such as the following:
 
Very low-contrast subjects
(Example: Blue skies, solid-color flat surfaces, etc.)
 
Subjects in very low light
 
Extremely backlit and reflective subjects
(Example: Cars with highly reflective bodies, etc.)
 
Near and far subjects covered by an AF point 
(Example: Animals in cages, etc.)
 
Repetitive patterns
(Example: Skyscraper windows, computer keyboards, etc.)
In such cases, do either of the following:
(1) With One-Shot AF, focus on an object at the same distance as the 
subject and lock the focus before recomposing the shot (p.59).
(2) Set the lens’s focus mode switch to <MF> and focus manually.
1
Set the lens’s focus mode switch 
to <MF>.
2
Focus on the subject.
 
Focus by turning the lens’s focusing 
ring until the subject looks sharp in 
the viewfinder.
Subjects Difficult to Focus
MF: Manual Focus
For subjects difficult to focus during Live View shooting with [FlexiZone - 
Single
] and [uLive mode], see page 146.
Focusing ring
If you press the shutter button halfway during manual focusing, the AF point 
achieving focus will light up briefly in red, the beeper will sound, and the 
focus confirmation light <o> in the viewfinder will light up.