Difficult subjects for AF (Auto Focus) (EOS 5DS / EOS 5DS R)
18-May-2015
8202601900
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:Subjects Difficult to Focus
- Subjects with very low contrast
(Example: Blue skies, solid-color flat surfaces, etc.)
- Subjects in very low light
- Strongly backlit or reflective subjects
(Example: Cars with highly reflective bodies, etc.)
- Near and distant subjects framed close to an AF point
(Example: Animals in cages, 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, focus by doing either of the following:
(1) With One-Shot AF, focus on an object at the same distance as the subject and lock the focus, then recompose 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.