Difficult subjects for AF (Auto Focus) (EOS 5DS / EOS 5DS R)

Article ID: ART162870 | Date published: 10/05/2015 | Date last updated: 10/05/2015


Difficult subjects for AF (Auto Focus) (EOS 5DS / EOS 5DS R)


Autofocus can fail to achieve focus (viewfinder’s focus indicator [ ] 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.

Depending on the subject, focus may be achieved by slightly recomposing the shot and performing AF operation again.

Shooting with Focus Lock (EOS 5DS / EOS 5DS R)



Rate this Article
Was this article helpful?
Yes, This document is helpful
No, This document needs a clearer explanation
Please provide your comments