Subjects Difficult To Focus On - Canon EOS 250D Advanced User's Manual

Subjects Difficult to Focus on

Autofocus may fail to achieve focus (focus indicator <o> in the viewfinder
blinks) with special subjects such as the following:
Subjects with very low contrast (Example: Blue skies, solid-color flat
z
surfaces, etc.)
Subjects in very low light
z
Strongly backlit or reflective subjects (Example: Car with a highly
z
reflective body, etc.)
Near and distant subjects positioned close to an AF point (Example:
z
Animals in cages, etc.)
Light source such as dots of light positioned close to an AF point
z
(Example: Night scenes, etc.)
Subjects with repetitive patterns (Example: Skyscraper windows,
z
computer keyboards, etc.)
Subjects with finer patterns than an AF point (Example: Faces or
z
flowers as small as or smaller than an AF point, etc.)
In such cases, focus in either of the following two ways.
(1) With One-Shot AF, focus on an object at the same distance as the
subject and lock the focus, then recompose the shot (= 74).
(2) Set the lens's focus mode switch to <MF> and focus manually.
Depending on the subject, focus may be achieved by slightly recomposing the
z
shot and performing AF operation again.
For conditions that make focusing difficult with AF during Live View shooting
z
or movie shooting, see page 202.
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