Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 894

Shooting-related problems The lens cannot be attached. The camera cannot be used with RF, EF-S, or EF-M lenses ( ). The viewfinder is dark. Install a charged battery in the camera ( ). No images can be shot or recorded. Make sure the card is properly inserted ( ). If the card is full, replace the card or delete unnecessary images to make space ( , ). Shooting is not possible during One-Shot AF when the focus indicator < > in the viewfinder is blinking, or when the AF point is orange during Live View shooting or movie recording. Press the shutter button halfway again to refocus automatically, or focus manually ( ). The card cannot be used. If a card error message is displayed, see Inserting/Removing Cards and Error Codes. I have to press the shutter button twice to take a picture. Set [ : Mirror lockup] to [Disable]. The image is out of focus or blurred. Set the lens's focus mode switch to < > ( ). Press the shutter button gently to prevent camera shake ( , ). With a lens equipped with an Image Stabilizer, set the Image Stabilizer switch to < >. In low light, the shutter speed may become slow. Use a faster shutter speed ( higher ISO speed ( ), use flash ( ), or use a tripod. See Minimizing blurred photos. ), set a There are fewer AF points or the Area AF frame shape is different. Depending on the lens used, the number of usable AF points, AF point patterns, Area AF frame shape, etc. vary ( ). 894