Difficult subjects for autofocus.

Article ID: ART159335 | Date published: 06/09/2015 | Date last updated: 09/29/2015


Difficult subjects for autofocus.


Autofocus can fail to achieve focus (the focus confirmation light <> blinks) with certain subjects such as the following:

  • Low-contrast subjects (blue sky, solid-color walls, etc.).
  • Subjects in low light.
  • Extremely backlit and reflective subjects (car with a reflective body, etc.).
  • Overlapping near and far objects (animal in a cage, etc.).
  • Lens and/or external AF sensor is dirty

In such cases, do one of the following:

  1. Focus an object at the same distance as the subject and lock the focus before recomposing.
  2. Set the lens focus mode switch to <MF> and focus manually.
  3. Ensure that the lens and any external sensors on the camera are clean. If necessary they may be cleaned with a soft cloth.



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