Canon EOS-1D C EOS 1D X Instruction Manual - Page 170

d: Program AE FAQ The focus confirmation light blinks and focus is not achieved. Aim the center of the Area AF frame over an area with good contrast, then press the shutter button halfway (p.46). If you are too close to the subject, move away and try again. Sometimes multiple AF points light up simultaneously. All those AF points have achieved focus. As long as the AF point covering the desired subject lights up, you can take the picture. The focus confirmation light does not light up. In the AI Servo AF mode, it indicates that the camera is focusing continuously on a moving subject. (Although the AF status indicator is displayed, the focus confirmation light does not light up.) Note that focus lock (p.67) will not work in the AI Servo AF mode. Pressing the shutter button halfway does not focus the subject. If the focus mode switch on the lens is set to (Manual Focus), set it to (Auto Focus). The shutter speed and aperture displays are blinking. Since it is too dark, taking the picture may result in a blurred subject due to camera shake. Using a tripod or a Canon EX-series Speedlite (p.194) (sold separately) is recommended. When flash was used, the bottom part of the picture came out unnaturally dark. If a hood is attached to the lens, it can obstruct the flash coverage. If the subject is close, detach the hood before taking the picture with flash. 170