Canon EOS Digital Rebel XT EF-S 18-55 Kit EOS DIGITAL Rebel XT / EOS 350D Inst - Page 76

When Autofocus Fails Manual Focusing

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When Autofocus Fails (Manual Focusing) Autofocus can fail to achieve focus (the focus confirmation light blinks) with certain subjects such as the following: Subjects Difficult to Focus (a) Low-contrast subjects Example: Blue sky, solid-color walls, etc. (b) Subjects in low light (c) Extremely backlit and reflective subjects Example: Car with a reflective body, etc. (d) Overlapping near and far objects Example: Animal in a cage, etc. (e) Repetitive patterns Example: Skyscraper windows, computer keyboards, etc. In such cases, do one of the following: (1) Focus an object at the same distance as the subject and lock the focus before recomposing. (p.75) (2) Set the lens focus mode switch to and focus manually. Manual Focusing Focusing ring 1 Set the lens focus mode switch to . 2 Focus the subject. ¡ Focus by turning the lens focusing ring until the subject is in focus in the viewfinder. If you press the shutter button halfway during manual focusing, the AF point(s) achieving focus and the focus confirmation light in the viewfinder will light when focus is achieved. 76

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76
Autofocus can fail to achieve focus (the focus confirmation light <
o
>
blinks) with certain subjects such as the following:
Subjects Difficult to Focus
(a)
Low-contrast subjects
Example: Blue sky, solid-color walls, etc.
(b)
Subjects in low light
(c)
Extremely backlit and reflective subjects
Example: Car with a reflective body, etc.
(d)
Overlapping near and far objects
Example: Animal in a cage, etc.
(e)
Repetitive patterns
Example: Skyscraper windows, computer keyboards, etc.
In such cases, do one of the following:
(1)
Focus an object at the same distance as the subject and lock the
focus before recomposing. (p.75)
(2)
Set the lens focus mode switch to <
MF
> and focus manually.
1
Set the lens focus mode switch to
<MF>.
2
Focus the subject.
¡
Focus by turning the lens focusing
ring until the subject is in focus in the
viewfinder.
When Autofocus Fails (Manual Focusing)
Manual Focusing
Focusing ring
If you press the shutter button halfway during manual focusing, the AF
point(s) achieving focus and the focus confirmation light <
o
> in the
viewfinder will light when focus is achieved.