Canon EOS 650 - Manual (Page 30)

9. Difficult Subjects for Autofocus
Although the AF system of the camera is very ac­
curate, it is not'perfect. The following subjects are
difficult for autofocus. When AF is impossible, the
green AF in-focus indicator will blink in the
viewfinder.
Subjects
Low contrast subjects
(misty scenes, light-colored or white objects)............ (A)
Subjects in extremely low-light situations
(a dark room, night scenes)...........................................(B)
Subjects having generally horizontal patterns
(window blinds)............................................................. (C)
Subjects in extremely strong backlight with
strong reflections
.....................................................................................(D)
Subjects with an object in front of them
(caged zoo animals)....................................................... (E)
Fast-moving subjects
(difficult to keep within the AF frame)...........................(F)
(C)
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(E)
Focus these subjects as follows:
1. Autofocus a substitute subject at the same
distance from the camera as your main sub­
ject, and then recompose the picture ....................... (A)
2. Flold the camera vertically and focus the sub­
ject using autofocus then recompose the pic­
ture .................................:.............................................(C)
3. Manually focus the subject following the steps on
the next page.
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