Difficult subjects for AF (Auto Focus)
06-Mar-2015
8202538700
Solution
Autofocus can fail to achieve focus (viewfinder’s focus indicator [ 
] blinks) with certain subjects such as the following:
] blinks) with certain subjects such as the following:- Very low-contrast subjects
(Example: Blue sky, solid-color walls, etc.)
- Subjects in very low light
- Strongly backlit or reflective subjects
(Example: Car with a highly reflective body, etc.)
- Near and distant subjects framed close to an AF point
(Example: Animal in a cage, etc.)
- Subjects such as dots of light framed close to an AF point
(Example: Night scenes, 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
(2) Set the lens’s focus mode switch to [ MF ] and focus manually.
NOTE
Depending on the subject, focus may be achieved by slightly recomposing the shot and performing AF operation again.